Merge branch 'master' into feature_check_curl

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+#       WELCOME TO SQUID 3.5.27
+#       ----------------------------
+#
+#       This is the documentation for the Squid configuration file.
+#       This documentation can also be found online at:
+#               http://www.squid-cache.org/Doc/config/
+#
+#       You may wish to look at the Squid home page and wiki for the
+#       FAQ and other documentation:
+#               http://www.squid-cache.org/
+#               http://wiki.squid-cache.org/SquidFaq
+#               http://wiki.squid-cache.org/ConfigExamples
+#
+#       This documentation shows what the defaults for various directives
+#       happen to be.  If you don't need to change the default, you should
+#       leave the line out of your squid.conf in most cases.
+#
+#       In some cases "none" refers to no default setting at all,
+#       while in other cases it refers to the value of the option
+#       - the comments for that keyword indicate if this is the case.
+#
+
+#  Configuration options can be included using the "include" directive.
+#  Include takes a list of files to include. Quoting and wildcards are
+#  supported.
+#
+#  For example,
+#
+#  include /path/to/included/file/squid.acl.config
+#
+#  Includes can be nested up to a hard-coded depth of 16 levels.
+#  This arbitrary restriction is to prevent recursive include references
+#  from causing Squid entering an infinite loop whilst trying to load
+#  configuration files.
+#
+#  Values with byte units
+#
+#       Squid accepts size units on some size related directives. All
+#       such directives are documented with a default value displaying
+#       a unit.
+#
+#       Units accepted by Squid are:
+#               bytes - byte
+#               KB - Kilobyte (1024 bytes)
+#               MB - Megabyte
+#               GB - Gigabyte
+#
+#  Values with spaces, quotes, and other special characters
+#
+#       Squid supports directive parameters with spaces, quotes, and other
+#       special characters. Surround such parameters with "double quotes". Use
+#       the configuration_includes_quoted_values directive to enable or
+#       disable that support.
+#
+#       Squid supports reading configuration option parameters from external
+#       files using the syntax:
+#               parameters("/path/filename")
+#       For example:
+#               acl whitelist dstdomain parameters("/etc/squid/whitelist.txt")
+#
+#  Conditional configuration
+#
+#       If-statements can be used to make configuration directives
+#       depend on conditions:
+#
+#           if <CONDITION>
+#               ... regular configuration directives ...
+#           [else
+#               ... regular configuration directives ...]
+#           endif
+#
+#       The else part is optional. The keywords "if", "else", and "endif"
+#       must be typed on their own lines, as if they were regular
+#       configuration directives.
+#
+#       NOTE: An else-if condition is not supported.
+#
+#       These individual conditions types are supported:
+#
+#           true
+#               Always evaluates to true.
+#           false
+#               Always evaluates to false.
+#           <integer> = <integer>
+#               Equality comparison of two integer numbers.
+#
+#
+#  SMP-Related Macros
+#
+#       The following SMP-related preprocessor macros can be used.
+#
+#       ${process_name} expands to the current Squid process "name"
+#       (e.g., squid1, squid2, or cache1).
+#
+#       ${process_number} expands to the current Squid process
+#       identifier, which is an integer number (e.g., 1, 2, 3) unique
+#       across all Squid processes of the current service instance.
+#
+#       ${service_name} expands into the current Squid service instance
+#       name identifier which is provided by -n on the command line.
+#
+
+#  TAG: broken_vary_encoding
+#       This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: cache_vary
+#       This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: error_map
+#       This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: external_refresh_check
+#       This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: location_rewrite_program
+#       This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: refresh_stale_hit
+#       This option is not yet supported by Squid-3.
+#Default:
+# none
+
+#  TAG: hierarchy_stoplist
+#       Remove this line. Use always_direct or cache_peer_access ACLs instead if you need to prevent cache_peer use.
+#Default:
+# none
+
+#  TAG: log_access
+#       Remove this line. Use acls with access_log directives to control access logging
+#Default:
+# none
+
+#  TAG: log_icap
+#       Remove this line. Use acls with icap_log directives to control icap logging
+#Default:
+# none
+
+#  TAG: ignore_ims_on_miss
+#       Remove this line. The HTTP/1.1 feature is now configured by 'cache_miss_revalidate'.
+#Default:
+# none
+
+#  TAG: chunked_request_body_max_size
+#       Remove this line. Squid is now HTTP/1.1 compliant.
+#Default:
+# none
+
+#  TAG: dns_v4_fallback
+#       Remove this line. Squid performs a 'Happy Eyeballs' algorithm, the 'fallback' algorithm is no longer relevant.
+#Default:
+# none
+
+#  TAG: emulate_httpd_log
+#       Replace this with an access_log directive using the format 'common' or 'combined'.
+#Default:
+# none
+
+#  TAG: forward_log
+#       Use a regular access.log with ACL limiting it to MISS events.
+#Default:
+# none
+
+#  TAG: ftp_list_width
+#       Remove this line. Configure FTP page display using the CSS controls in errorpages.css instead.
+#Default:
+# none
+
+#  TAG: ignore_expect_100
+#       Remove this line. The HTTP/1.1 feature is now fully supported by default.
+#Default:
+# none
+
+#  TAG: log_fqdn
+#       Remove this option from your config. To log FQDN use %>A in the log format.
+#Default:
+# none
+
+#  TAG: log_ip_on_direct
+#       Remove this option from your config. To log server or peer names use %<A in the log format.
+#Default:
+# none
+
+#  TAG: maximum_single_addr_tries
+#       Replaced by connect_retries. The behaviour has changed, please read the documentation before altering.
+#Default:
+# none
+
+#  TAG: referer_log
+#       Replace this with an access_log directive using the format 'referrer'.
+#Default:
+# none
+
+#  TAG: update_headers
+#       Remove this line. The feature is supported by default in storage types where update is implemented.
+#Default:
+# none
+
+#  TAG: url_rewrite_concurrency
+#       Remove this line. Set the 'concurrency=' option of url_rewrite_children instead.
+#Default:
+# none
+
+#  TAG: useragent_log
+#       Replace this with an access_log directive using the format 'useragent'.
+#Default:
+# none
+
+#  TAG: dns_testnames
+#       Remove this line. DNS is no longer tested on startup.
+#Default:
+# none
+
+#  TAG: extension_methods
+#       Remove this line. All valid methods for HTTP are accepted by default.
+#Default:
+# none
+
+#  TAG: zero_buffers
+#Default:
+# none
+
+#  TAG: incoming_rate
+#Default:
+# none
+
+#  TAG: server_http11
+#       Remove this line. HTTP/1.1 is supported by default.
+#Default:
+# none
+
+#  TAG: upgrade_http0.9
+#       Remove this line. ICY/1.0 streaming protocol is supported by default.
+#Default:
+# none
+
+#  TAG: zph_local
+#       Alter these entries. Use the qos_flows directive instead.
+#Default:
+# none
+
+#  TAG: header_access
+#       Since squid-3.0 replace with request_header_access or reply_header_access
+#       depending on whether you wish to match client requests or server replies.
+#Default:
+# none
+
+#  TAG: httpd_accel_no_pmtu_disc
+#       Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead.
+#Default:
+# none
+
+#  TAG: wais_relay_host
+#       Replace this line with 'cache_peer' configuration.
+#Default:
+# none
+
+#  TAG: wais_relay_port
+#       Replace this line with 'cache_peer' configuration.
+#Default:
+# none
+
+# OPTIONS FOR SMP
+# -----------------------------------------------------------------------------
+
+#  TAG: workers
+#       Number of main Squid processes or "workers" to fork and maintain.
+#       0: "no daemon" mode, like running "squid -N ..."
+#       1: "no SMP" mode, start one main Squid process daemon (default)
+#       N: start N main Squid process daemons (i.e., SMP mode)
+#
+#       In SMP mode, each worker does nearly all what a single Squid daemon
+#       does (e.g., listen on http_port and forward HTTP requests).
+#Default:
+# SMP support disabled.
+
+#  TAG: cpu_affinity_map
+#       Usage: cpu_affinity_map process_numbers=P1,P2,... cores=C1,C2,...
+#
+#       Sets 1:1 mapping between Squid processes and CPU cores. For example,
+#
+#           cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7
+#
+#       affects processes 1 through 4 only and places them on the first
+#       four even cores, starting with core #1.
+#
+#       CPU cores are numbered starting from 1. Requires support for
+#       sched_getaffinity(2) and sched_setaffinity(2) system calls.
+#
+#       Multiple cpu_affinity_map options are merged.
+#
+#       See also: workers
+#Default:
+# Let operating system decide.
+
+# OPTIONS FOR AUTHENTICATION
+# -----------------------------------------------------------------------------
+
+#  TAG: auth_param
+#       This is used to define parameters for the various authentication
+#       schemes supported by Squid.
+#
+#               format: auth_param scheme parameter [setting]
+#
+#       The order in which authentication schemes are presented to the client is
+#       dependent on the order the scheme first appears in config file. IE
+#       has a bug (it's not RFC 2617 compliant) in that it will use the basic
+#       scheme if basic is the first entry presented, even if more secure
+#       schemes are presented. For now use the order in the recommended
+#       settings section below. If other browsers have difficulties (don't
+#       recognize the schemes offered even if you are using basic) either
+#       put basic first, or disable the other schemes (by commenting out their
+#       program entry).
+#
+#       Once an authentication scheme is fully configured, it can only be
+#       shutdown by shutting squid down and restarting. Changes can be made on
+#       the fly and activated with a reconfigure. I.E. You can change to a
+#       different helper, but not unconfigure the helper completely.
+#
+#       Please note that while this directive defines how Squid processes
+#       authentication it does not automatically activate authentication.
+#       To use authentication you must in addition make use of ACLs based
+#       on login name in http_access (proxy_auth, proxy_auth_regex or
+#       external with %LOGIN used in the format tag). The browser will be
+#       challenged for authentication on the first such acl encountered
+#       in http_access processing and will also be re-challenged for new
+#       login credentials if the request is being denied by a proxy_auth
+#       type acl.
+#
+#       WARNING: authentication can't be used in a transparently intercepting
+#       proxy as the client then thinks it is talking to an origin server and
+#       not the proxy. This is a limitation of bending the TCP/IP protocol to
+#       transparently intercepting port 80, not a limitation in Squid.
+#       Ports flagged 'transparent', 'intercept', or 'tproxy' have
+#       authentication disabled.
+#
+#       === Parameters common to all schemes. ===
+#
+#       "program" cmdline
+#               Specifies the command for the external authenticator.
+#
+#               By default, each authentication scheme is not used unless a
+#               program is specified.
+#
+#               See http://wiki.squid-cache.org/Features/AddonHelpers for
+#               more details on helper operations and creating your own.
+#
+#       "key_extras" format
+#               Specifies a string to be append to request line format for
+#               the authentication helper. "Quoted" format values may contain
+#               spaces and logformat %macros. In theory, any logformat %macro
+#               can be used. In practice, a %macro expands as a dash (-) if
+#               the helper request is sent before the required macro
+#               information is available to Squid.
+#
+#               By default, Squid uses request formats provided in
+#               scheme-specific examples below (search for %credentials).
+#
+#               The expanded key_extras value is added to the Squid credentials
+#               cache and, hence, will affect authentication. It can be used to
+#               autenticate different users with identical user names (e.g.,
+#               when user authentication depends on http_port).
+#
+#               Avoid adding frequently changing information to key_extras. For
+#               example, if you add user source IP, and it changes frequently
+#               in your environment, then max_user_ip ACL is going to treat
+#               every user+IP combination as a unique "user", breaking the ACL
+#               and wasting a lot of memory on those user records. It will also
+#               force users to authenticate from scratch whenever their IP
+#               changes.
+#
+#       "realm" string
+#               Specifies the protection scope (aka realm name) which is to be
+#               reported to the client for the authentication scheme. It is
+#               commonly part of the text the user will see when prompted for
+#               their username and password.
+#
+#               For Basic the default is "Squid proxy-caching web server".
+#               For Digest there is no default, this parameter is mandatory.
+#               For NTLM and Negotiate this parameter is ignored.
+#
+#       "children" numberofchildren [startup=N] [idle=N] [concurrency=N]
+#
+#               The maximum number of authenticator processes to spawn. If
+#               you start too few Squid will have to wait for them to process
+#               a backlog of credential verifications, slowing it down. When
+#               password verifications are done via a (slow) network you are
+#               likely to need lots of authenticator processes.
+#
+#               The startup= and idle= options permit some skew in the exact
+#               amount run. A minimum of startup=N will begin during startup
+#               and reconfigure. Squid will start more in groups of up to
+#               idle=N in an attempt to meet traffic needs and to keep idle=N
+#               free above those traffic needs up to the maximum.
+#
+#               The concurrency= option sets the number of concurrent requests
+#               the helper can process.  The default of 0 is used for helpers
+#               who only supports one request at a time. Setting this to a
+#               number greater than 0 changes the protocol used to include a
+#               channel ID field first on the request/response line, allowing
+#               multiple requests to be sent to the same helper in parallel
+#               without waiting for the response.
+#
+#               Concurrency must not be set unless it's known the helper
+#               supports the input format with channel-ID fields.
+#
+#               NOTE: NTLM and Negotiate schemes do not support concurrency
+#                       in the Squid code module even though some helpers can.
+#
+#
+#
+#       === Example Configuration ===
+#
+#       This configuration displays the recommended authentication scheme
+#       order from most to least secure with recommended minimum configuration
+#       settings for each scheme:
+#
+##auth_param negotiate program <uncomment and complete this line to activate>
+##auth_param negotiate children 20 startup=0 idle=1
+##auth_param negotiate keep_alive on
+##
+##auth_param digest program <uncomment and complete this line to activate>
+##auth_param digest children 20 startup=0 idle=1
+##auth_param digest realm Squid proxy-caching web server
+##auth_param digest nonce_garbage_interval 5 minutes
+##auth_param digest nonce_max_duration 30 minutes
+##auth_param digest nonce_max_count 50
+##
+##auth_param ntlm program <uncomment and complete this line to activate>
+##auth_param ntlm children 20 startup=0 idle=1
+##auth_param ntlm keep_alive on
+##
+##auth_param basic program <uncomment and complete this line>
+##auth_param basic children 5 startup=5 idle=1
+##auth_param basic realm Squid proxy-caching web server
+##auth_param basic credentialsttl 2 hours
+#Default:
+# none
+
+#  TAG: authenticate_cache_garbage_interval
+#       The time period between garbage collection across the username cache.
+#       This is a trade-off between memory utilization (long intervals - say
+#       2 days) and CPU (short intervals - say 1 minute). Only change if you
+#       have good reason to.
+#Default:
+# authenticate_cache_garbage_interval 1 hour
+
+#  TAG: authenticate_ttl
+#       The time a user & their credentials stay in the logged in
+#       user cache since their last request. When the garbage
+#       interval passes, all user credentials that have passed their
+#       TTL are removed from memory.
+#Default:
+# authenticate_ttl 1 hour
+
+#  TAG: authenticate_ip_ttl
+#       If you use proxy authentication and the 'max_user_ip' ACL,
+#       this directive controls how long Squid remembers the IP
+#       addresses associated with each user.  Use a small value
+#       (e.g., 60 seconds) if your users might change addresses
+#       quickly, as is the case with dialup.   You might be safe
+#       using a larger value (e.g., 2 hours) in a corporate LAN
+#       environment with relatively static address assignments.
+#Default:
+# authenticate_ip_ttl 1 second
+
+# ACCESS CONTROLS
+# -----------------------------------------------------------------------------
+
+#  TAG: external_acl_type
+#       This option defines external acl classes using a helper program
+#       to look up the status
+#
+#         external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..]
+#
+#       Options:
+#
+#         ttl=n         TTL in seconds for cached results (defaults to 3600
+#                       for 1 hour)
+#
+#         negative_ttl=n
+#                       TTL for cached negative lookups (default same
+#                       as ttl)
+#
+#         grace=n       Percentage remaining of TTL where a refresh of a
+#                       cached entry should be initiated without needing to
+#                       wait for a new reply. (default is for no grace period)
+#
+#         cache=n       The maximum number of entries in the result cache. The
+#                       default limit is 262144 entries.  Each cache entry usually
+#                       consumes at least 256 bytes. Squid currently does not remove
+#                       expired cache entries until the limit is reached, so a proxy
+#                       will sooner or later reach the limit. The expanded FORMAT
+#                       value is used as the cache key, so if the details in FORMAT
+#                       are highly variable, a larger cache may be needed to produce
+#                       reduction in helper load.
+#
+#         children-max=n
+#                       Maximum number of acl helper processes spawned to service
+#                       external acl lookups of this type. (default 5)
+#
+#         children-startup=n
+#                       Minimum number of acl helper processes to spawn during
+#                       startup and reconfigure to service external acl lookups
+#                       of this type. (default 0)
+#
+#         children-idle=n
+#                       Number of acl helper processes to keep ahead of traffic
+#                       loads. Squid will spawn this many at once whenever load
+#                       rises above the capabilities of existing processes.
+#                       Up to the value of children-max. (default 1)
+#
+#         concurrency=n concurrency level per process. Only used with helpers
+#                       capable of processing more than one query at a time.
+#
+#         protocol=2.5  Compatibility mode for Squid-2.5 external acl helpers.
+#
+#         ipv4 / ipv6   IP protocol used to communicate with this helper.
+#                       The default is to auto-detect IPv6 and use it when available.
+#
+#
+#       FORMAT specifications
+#
+#         %LOGIN        Authenticated user login name
+#         %un           A user name. Expands to the first available name
+#                       from the following list of information sources:
+#                       - authenticated user name, like %ul or %LOGIN
+#                       - user name sent by an external ACL, like %EXT_USER
+#                       - SSL client name, like %us in logformat
+#                       - ident user name, like %ui in logformat
+#         %EXT_USER     Username from previous external acl
+#         %EXT_LOG      Log details from previous external acl
+#         %EXT_TAG      Tag from previous external acl
+#         %IDENT        Ident user name
+#         %SRC          Client IP
+#         %SRCPORT      Client source port
+#         %URI          Requested URI
+#         %DST          Requested host
+#         %PROTO        Requested URL scheme
+#         %PORT         Requested port
+#         %PATH         Requested URL path
+#         %METHOD       Request method
+#         %MYADDR       Squid interface address
+#         %MYPORT       Squid http_port number
+#         %PATH         Requested URL-path (including query-string if any)
+#         %USER_CERT    SSL User certificate in PEM format
+#         %USER_CERTCHAIN SSL User certificate chain in PEM format
+#         %USER_CERT_xx SSL User certificate subject attribute xx
+#         %USER_CA_CERT_xx SSL User certificate issuer attribute xx
+#         %ssl::>sni    SSL client SNI sent to Squid
+#         %ssl::<cert_subject SSL server certificate DN
+#         %ssl::<cert_issuer SSL server certificate issuer DN
+#
+#         %>{Header}    HTTP request header "Header"
+#         %>{Hdr:member}
+#                       HTTP request header "Hdr" list member "member"
+#         %>{Hdr:;member}
+#                       HTTP request header list member using ; as
+#                       list separator. ; can be any non-alphanumeric
+#                       character.
+#
+#         %<{Header}    HTTP reply header "Header"
+#         %<{Hdr:member}
+#                       HTTP reply header "Hdr" list member "member"
+#         %<{Hdr:;member}
+#                       HTTP reply header list member using ; as
+#                       list separator. ; can be any non-alphanumeric
+#                       character.
+#
+#         %ACL          The name of the ACL being tested.
+#         %DATA         The ACL arguments. If not used then any arguments
+#                       is automatically added at the end of the line
+#                       sent to the helper.
+#                       NOTE: this will encode the arguments as one token,
+#                       whereas the default will pass each separately.
+#
+#         %%            The percent sign. Useful for helpers which need
+#                       an unchanging input format.
+#
+#
+#       General request syntax:
+#
+#         [channel-ID] FORMAT-values [acl-values ...]
+#
+#
+#       FORMAT-values consists of transaction details expanded with
+#       whitespace separation per the config file FORMAT specification
+#       using the FORMAT macros listed above.
+#
+#       acl-values consists of any string specified in the referencing
+#       config 'acl ... external' line. see the "acl external" directive.
+#
+#       Request values sent to the helper are URL escaped to protect
+#       each value in requests against whitespaces.
+#
+#       If using protocol=2.5 then the request sent to the helper is not
+#       URL escaped to protect against whitespace.
+#
+#       NOTE: protocol=3.0 is deprecated as no longer necessary.
+#
+#       When using the concurrency= option the protocol is changed by
+#       introducing a query channel tag in front of the request/response.
+#       The query channel tag is a number between 0 and concurrency-1.
+#       This value must be echoed back unchanged to Squid as the first part
+#       of the response relating to its request.
+#
+#
+#       The helper receives lines expanded per the above format specification
+#       and for each input line returns 1 line starting with OK/ERR/BH result
+#       code and optionally followed by additional keywords with more details.
+#
+#
+#       General result syntax:
+#
+#         [channel-ID] result keyword=value ...
+#
+#       Result consists of one of the codes:
+#
+#         OK
+#               the ACL test produced a match.
+#
+#         ERR
+#               the ACL test does not produce a match.
+#
+#         BH
+#               An internal error occurred in the helper, preventing
+#               a result being identified.
+#
+#       The meaning of 'a match' is determined by your squid.conf
+#       access control configuration. See the Squid wiki for details.
+#
+#       Defined keywords:
+#
+#         user=         The users name (login)
+#
+#         password=     The users password (for login= cache_peer option)
+#
+#         message=      Message describing the reason for this response.
+#                       Available as %o in error pages.
+#                       Useful on (ERR and BH results).
+#
+#         tag=          Apply a tag to a request. Only sets a tag once,
+#                       does not alter existing tags.
+#
+#         log=          String to be logged in access.log. Available as
+#                       %ea in logformat specifications.
+#
+#         clt_conn_tag= Associates a TAG with the client TCP connection.
+#                       Please see url_rewrite_program related documentation
+#                       for this kv-pair.
+#
+#       Any keywords may be sent on any response whether OK, ERR or BH.
+#
+#       All response keyword values need to be a single token with URL
+#       escaping, or enclosed in double quotes (") and escaped using \ on
+#       any double quotes or \ characters within the value. The wrapping
+#       double quotes are removed before the value is interpreted by Squid.
+#       \r and \n are also replace by CR and LF.
+#
+#       Some example key values:
+#
+#               user=John%20Smith
+#               user="John Smith"
+#               user="J. \"Bob\" Smith"
+#Default:
+# none
+
+#  TAG: acl
+#       Defining an Access List
+#
+#       Every access list definition must begin with an aclname and acltype,
+#       followed by either type-specific arguments or a quoted filename that
+#       they are read from.
+#
+#          acl aclname acltype argument ...
+#          acl aclname acltype "file" ...
+#
+#       When using "file", the file should contain one item per line.
+#
+#       Some acl types supports options which changes their default behaviour.
+#       The available options are:
+#
+#       -i,+i   By default, regular expressions are CASE-SENSITIVE. To make them
+#               case-insensitive, use the -i option. To return case-sensitive
+#               use the +i option between patterns, or make a new ACL line
+#               without -i.
+#
+#       -n      Disable lookups and address type conversions.  If lookup or
+#               conversion is required because the parameter type (IP or
+#               domain name) does not match the message address type (domain
+#               name or IP), then the ACL would immediately declare a mismatch
+#               without any warnings or lookups.
+#
+#       --      Used to stop processing all options, in the case the first acl
+#               value has '-' character as first character (for example the '-'
+#               is a valid domain name)
+#
+#       Some acl types require suspending the current request in order
+#       to access some external data source.
+#       Those which do are marked with the tag [slow], those which
+#       don't are marked as [fast].
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl
+#       for further information
+#
+#       ***** ACL TYPES AVAILABLE *****
+#
+#       acl aclname src ip-address/mask ...     # clients IP address [fast]
+#       acl aclname src addr1-addr2/mask ...    # range of addresses [fast]
+#       acl aclname dst [-n] ip-address/mask ...        # URL host's IP address [slow]
+#       acl aclname localip ip-address/mask ... # IP address the client connected to [fast]
+#
+#       acl aclname arp      mac-address ... (xx:xx:xx:xx:xx:xx notation)
+#         # [fast]
+#         # The 'arp' ACL code is not portable to all operating systems.
+#         # It works on Linux, Solaris, Windows, FreeBSD, and some other
+#         # BSD variants.
+#         #
+#         # NOTE: Squid can only determine the MAC/EUI address for IPv4
+#         # clients that are on the same subnet. If the client is on a
+#         # different subnet, then Squid cannot find out its address.
+#         #
+#         # NOTE 2: IPv6 protocol does not contain ARP. MAC/EUI is either
+#         # encoded directly in the IPv6 address or not available.
+#
+#       acl aclname srcdomain   .foo.com ...
+#         # reverse lookup, from client IP [slow]
+#       acl aclname dstdomain [-n] .foo.com ...
+#         # Destination server from URL [fast]
+#       acl aclname srcdom_regex [-i] \.foo\.com ...
+#         # regex matching client name [slow]
+#       acl aclname dstdom_regex [-n] [-i] \.foo\.com ...
+#         # regex matching server [fast]
+#         #
+#         # For dstdomain and dstdom_regex a reverse lookup is tried if a IP
+#         # based URL is used and no match is found. The name "none" is used
+#         # if the reverse lookup fails.
+#
+#       acl aclname src_as number ...
+#       acl aclname dst_as number ...
+#         # [fast]
+#         # Except for access control, AS numbers can be used for
+#         # routing of requests to specific caches. Here's an
+#         # example for routing all requests for AS#1241 and only
+#         # those to mycache.mydomain.net:
+#         # acl asexample dst_as 1241
+#         # cache_peer_access mycache.mydomain.net allow asexample
+#         # cache_peer_access mycache_mydomain.net deny all
+#
+#       acl aclname peername myPeer ...
+#         # [fast]
+#         # match against a named cache_peer entry
+#         # set unique name= on cache_peer lines for reliable use.
+#
+#       acl aclname time [day-abbrevs] [h1:m1-h2:m2]
+#         # [fast]
+#         #  day-abbrevs:
+#         #     S - Sunday
+#         #     M - Monday
+#         #     T - Tuesday
+#         #     W - Wednesday
+#         #     H - Thursday
+#         #     F - Friday
+#         #     A - Saturday
+#         #  h1:m1 must be less than h2:m2
+#
+#       acl aclname url_regex [-i] ^http:// ...
+#         # regex matching on whole URL [fast]
+#       acl aclname urllogin [-i] [^a-zA-Z0-9] ...
+#         # regex matching on URL login field
+#       acl aclname urlpath_regex [-i] \.gif$ ...
+#         # regex matching on URL path [fast]
+#
+#       acl aclname port 80 70 21 0-1024...   # destination TCP port [fast]
+#                                             # ranges are alloed
+#       acl aclname localport 3128 ...        # TCP port the client connected to [fast]
+#                                             # NP: for interception mode this is usually '80'
+#
+#       acl aclname myportname 3128 ...       # *_port name [fast]
+#
+#       acl aclname proto HTTP FTP ...        # request protocol [fast]
+#
+#       acl aclname method GET POST ...       # HTTP request method [fast]
+#
+#       acl aclname http_status 200 301 500- 400-403 ...
+#         # status code in reply [fast]
+#
+#       acl aclname browser [-i] regexp ...
+#         # pattern match on User-Agent header (see also req_header below) [fast]
+#
+#       acl aclname referer_regex [-i] regexp ...
+#         # pattern match on Referer header [fast]
+#         # Referer is highly unreliable, so use with care
+#
+#       acl aclname ident username ...
+#       acl aclname ident_regex [-i] pattern ...
+#         # string match on ident output [slow]
+#         # use REQUIRED to accept any non-null ident.
+#
+#       acl aclname proxy_auth [-i] username ...
+#       acl aclname proxy_auth_regex [-i] pattern ...
+#         # perform http authentication challenge to the client and match against
+#         # supplied credentials [slow]
+#         #
+#         # takes a list of allowed usernames.
+#         # use REQUIRED to accept any valid username.
+#         #
+#         # Will use proxy authentication in forward-proxy scenarios, and plain
+#         # http authenticaiton in reverse-proxy scenarios
+#         #
+#         # NOTE: when a Proxy-Authentication header is sent but it is not
+#         # needed during ACL checking the username is NOT logged
+#         # in access.log.
+#         #
+#         # NOTE: proxy_auth requires a EXTERNAL authentication program
+#         # to check username/password combinations (see
+#         # auth_param directive).
+#         #
+#         # NOTE: proxy_auth can't be used in a transparent/intercepting proxy
+#         # as the browser needs to be configured for using a proxy in order
+#         # to respond to proxy authentication.
+#
+#       acl aclname snmp_community string ...
+#         # A community string to limit access to your SNMP Agent [fast]
+#         # Example:
+#         #
+#         #     acl snmppublic snmp_community public
+#
+#       acl aclname maxconn number
+#         # This will be matched when the client's IP address has
+#         # more than <number> TCP connections established. [fast]
+#         # NOTE: This only measures direct TCP links so X-Forwarded-For
+#         # indirect clients are not counted.
+#
+#       acl aclname max_user_ip [-s] number
+#         # This will be matched when the user attempts to log in from more
+#         # than <number> different ip addresses. The authenticate_ip_ttl
+#         # parameter controls the timeout on the ip entries. [fast]
+#         # If -s is specified the limit is strict, denying browsing
+#         # from any further IP addresses until the ttl has expired. Without
+#         # -s Squid will just annoy the user by "randomly" denying requests.
+#         # (the counter is reset each time the limit is reached and a
+#         # request is denied)
+#         # NOTE: in acceleration mode or where there is mesh of child proxies,
+#         # clients may appear to come from multiple addresses if they are
+#         # going through proxy farms, so a limit of 1 may cause user problems.
+#
+#       acl aclname random probability
+#         # Pseudo-randomly match requests. Based on the probability given.
+#         # Probability may be written as a decimal (0.333), fraction (1/3)
+#         # or ratio of matches:non-matches (3:5).
+#
+#       acl aclname req_mime_type [-i] mime-type ...
+#         # regex match against the mime type of the request generated
+#         # by the client. Can be used to detect file upload or some
+#         # types HTTP tunneling requests [fast]
+#         # NOTE: This does NOT match the reply. You cannot use this
+#         # to match the returned file type.
+#
+#       acl aclname req_header header-name [-i] any\.regex\.here
+#         # regex match against any of the known request headers.  May be
+#         # thought of as a superset of "browser", "referer" and "mime-type"
+#         # ACL [fast]
+#
+#       acl aclname rep_mime_type [-i] mime-type ...
+#         # regex match against the mime type of the reply received by
+#         # squid. Can be used to detect file download or some
+#         # types HTTP tunneling requests. [fast]
+#         # NOTE: This has no effect in http_access rules. It only has
+#         # effect in rules that affect the reply data stream such as
+#         # http_reply_access.
+#
+#       acl aclname rep_header header-name [-i] any\.regex\.here
+#         # regex match against any of the known reply headers. May be
+#         # thought of as a superset of "browser", "referer" and "mime-type"
+#         # ACLs [fast]
+#
+#       acl aclname external class_name [arguments...]
+#         # external ACL lookup via a helper class defined by the
+#         # external_acl_type directive [slow]
+#
+#       acl aclname user_cert attribute values...
+#         # match against attributes in a user SSL certificate
+#         # attribute is one of DN/C/O/CN/L/ST or a numerical OID [fast]
+#
+#       acl aclname ca_cert attribute values...
+#         # match against attributes a users issuing CA SSL certificate
+#         # attribute is one of DN/C/O/CN/L/ST or a numerical OID  [fast]
+#
+#       acl aclname ext_user username ...
+#       acl aclname ext_user_regex [-i] pattern ...
+#         # string match on username returned by external acl helper [slow]
+#         # use REQUIRED to accept any non-null user name.
+#
+#       acl aclname tag tagvalue ...
+#         # string match on tag returned by external acl helper [fast]
+#         # DEPRECATED. Only the first tag will match with this ACL.
+#         # Use the 'note' ACL instead for handling multiple tag values.
+#
+#       acl aclname hier_code codename ...
+#         # string match against squid hierarchy code(s); [fast]
+#         #  e.g., DIRECT, PARENT_HIT, NONE, etc.
+#         #
+#         # NOTE: This has no effect in http_access rules. It only has
+#         # effect in rules that affect the reply data stream such as
+#         # http_reply_access.
+#
+#       acl aclname note name [value ...]
+#         # match transaction annotation [fast]
+#         # Without values, matches any annotation with a given name.
+#         # With value(s), matches any annotation with a given name that
+#         # also has one of the given values.
+#         # Names and values are compared using a string equality test.
+#         # Annotation sources include note and adaptation_meta directives
+#         # as well as helper and eCAP responses.
+#
+#       acl aclname adaptation_service service ...
+#         # Matches the name of any icap_service, ecap_service,
+#         # adaptation_service_set, or adaptation_service_chain that Squid
+#         # has used (or attempted to use) for the master transaction.
+#         # This ACL must be defined after the corresponding adaptation
+#         # service is named in squid.conf. This ACL is usable with
+#         # adaptation_meta because it starts matching immediately after
+#         # the service has been selected for adaptation.
+#
+#       acl aclname any-of acl1 acl2 ...
+#         # match any one of the acls [fast or slow]
+#         # The first matching ACL stops further ACL evaluation.
+#         #
+#         # ACLs from multiple any-of lines with the same name are ORed.
+#         # For example, A = (a1 or a2) or (a3 or a4) can be written as
+#         #   acl A any-of a1 a2
+#         #   acl A any-of a3 a4
+#         #
+#         # This group ACL is fast if all evaluated ACLs in the group are fast
+#         # and slow otherwise.
+#
+#       acl aclname all-of acl1 acl2 ...
+#         # match all of the acls [fast or slow]
+#         # The first mismatching ACL stops further ACL evaluation.
+#         #
+#         # ACLs from multiple all-of lines with the same name are ORed.
+#         # For example, B = (b1 and b2) or (b3 and b4) can be written as
+#         #   acl B all-of b1 b2
+#         #   acl B all-of b3 b4
+#         #
+#         # This group ACL is fast if all evaluated ACLs in the group are fast
+#         # and slow otherwise.
+#
+#       Examples:
+#               acl macaddress arp 09:00:2b:23:45:67
+#               acl myexample dst_as 1241
+#               acl password proxy_auth REQUIRED
+#               acl fileupload req_mime_type -i ^multipart/form-data$
+#               acl javascript rep_mime_type -i ^application/x-javascript$
+#
+#Default:
+# ACLs all, manager, localhost, and to_localhost are predefined.
+#
+#
+# Recommended minimum configuration:
+#
+
+# Example rule allowing access from your local networks.
+# Adapt to list your (internal) IP networks from where browsing
+# should be allowed
+acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
+acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
+acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
+acl localnet src fc00::/7       # RFC 4193 local private network range
+acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines
+
+acl SSL_ports port 443
+acl Safe_ports port 80          # http
+acl Safe_ports port 21          # ftp
+acl Safe_ports port 443         # https
+acl Safe_ports port 70          # gopher
+acl Safe_ports port 210         # wais
+acl Safe_ports port 1025-65535  # unregistered ports
+acl Safe_ports port 280         # http-mgmt
+acl Safe_ports port 488         # gss-http
+acl Safe_ports port 591         # filemaker
+acl Safe_ports port 777         # multiling http
+acl CONNECT method CONNECT
+
+#  TAG: proxy_protocol_access
+#       Determine which client proxies can be trusted to provide correct
+#       information regarding real client IP address using PROXY protocol.
+#
+#       Requests may pass through a chain of several other proxies
+#       before reaching us. The original source details may by sent in:
+#               * HTTP message Forwarded header, or
+#               * HTTP message X-Forwarded-For header, or
+#               * PROXY protocol connection header.
+#
+#       This directive is solely for validating new PROXY protocol
+#       connections received from a port flagged with require-proxy-header.
+#       It is checked only once after TCP connection setup.
+#
+#       A deny match results in TCP connection closure.
+#
+#       An allow match is required for Squid to permit the corresponding
+#       TCP connection, before Squid even looks for HTTP request headers.
+#       If there is an allow match, Squid starts using PROXY header information
+#       to determine the source address of the connection for all future ACL
+#       checks, logging, etc.
+#
+#       SECURITY CONSIDERATIONS:
+#
+#               Any host from which we accept client IP details can place
+#               incorrect information in the relevant header, and Squid
+#               will use the incorrect information as if it were the
+#               source address of the request.  This may enable remote
+#               hosts to bypass any access control restrictions that are
+#               based on the client's source addresses.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# all TCP connections to ports with require-proxy-header will be denied
+
+#  TAG: follow_x_forwarded_for
+#       Determine which client proxies can be trusted to provide correct
+#       information regarding real client IP address.
+#
+#       Requests may pass through a chain of several other proxies
+#       before reaching us. The original source details may by sent in:
+#               * HTTP message Forwarded header, or
+#               * HTTP message X-Forwarded-For header, or
+#               * PROXY protocol connection header.
+#
+#       PROXY protocol connections are controlled by the proxy_protocol_access
+#       directive which is checked before this.
+#
+#       If a request reaches us from a source that is allowed by this
+#       directive, then we trust the information it provides regarding
+#       the IP of the client it received from (if any).
+#
+#       For the purpose of ACLs used in this directive the src ACL type always
+#       matches the address we are testing and srcdomain matches its rDNS.
+#
+#       On each HTTP request Squid checks for X-Forwarded-For header fields.
+#       If found the header values are iterated in reverse order and an allow
+#       match is required for Squid to continue on to the next value.
+#       The verification ends when a value receives a deny match, cannot be
+#       tested, or there are no more values to test.
+#       NOTE: Squid does not yet follow the Forwarded HTTP header.
+#
+#       The end result of this process is an IP address that we will
+#       refer to as the indirect client address.  This address may
+#       be treated as the client address for access control, ICAP, delay
+#       pools and logging, depending on the acl_uses_indirect_client,
+#       icap_uses_indirect_client, delay_pool_uses_indirect_client,
+#       log_uses_indirect_client and tproxy_uses_indirect_client options.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#       SECURITY CONSIDERATIONS:
+#
+#               Any host from which we accept client IP details can place
+#               incorrect information in the relevant header, and Squid
+#               will use the incorrect information as if it were the
+#               source address of the request.  This may enable remote
+#               hosts to bypass any access control restrictions that are
+#               based on the client's source addresses.
+#
+#       For example:
+#
+#               acl localhost src 127.0.0.1
+#               acl my_other_proxy srcdomain .proxy.example.com
+#               follow_x_forwarded_for allow localhost
+#               follow_x_forwarded_for allow my_other_proxy
+#Default:
+# X-Forwarded-For header will be ignored.
+
+#  TAG: acl_uses_indirect_client        on|off
+#       Controls whether the indirect client address
+#       (see follow_x_forwarded_for) is used instead of the
+#       direct client address in acl matching.
+#
+#       NOTE: maxconn ACL considers direct TCP links and indirect
+#             clients will always have zero. So no match.
+#Default:
+# acl_uses_indirect_client on
+
+#  TAG: delay_pool_uses_indirect_client on|off
+#       Controls whether the indirect client address
+#       (see follow_x_forwarded_for) is used instead of the
+#       direct client address in delay pools.
+#Default:
+# delay_pool_uses_indirect_client on
+
+#  TAG: log_uses_indirect_client        on|off
+#       Controls whether the indirect client address
+#       (see follow_x_forwarded_for) is used instead of the
+#       direct client address in the access log.
+#Default:
+# log_uses_indirect_client on
+
+#  TAG: tproxy_uses_indirect_client     on|off
+#       Controls whether the indirect client address
+#       (see follow_x_forwarded_for) is used instead of the
+#       direct client address when spoofing the outgoing client.
+#
+#       This has no effect on requests arriving in non-tproxy
+#       mode ports.
+#
+#       SECURITY WARNING: Usage of this option is dangerous
+#       and should not be used trivially. Correct configuration
+#       of follow_x_forwarded_for with a limited set of trusted
+#       sources is required to prevent abuse of your proxy.
+#Default:
+# tproxy_uses_indirect_client off
+
+#  TAG: spoof_client_ip
+#       Control client IP address spoofing of TPROXY traffic based on
+#       defined access lists.
+#
+#       spoof_client_ip allow|deny [!]aclname ...
+#
+#       If there are no "spoof_client_ip" lines present, the default
+#       is to "allow" spoofing of any suitable request.
+#
+#       Note that the cache_peer "no-tproxy" option overrides this ACL.
+#
+#       This clause supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow spoofing on all TPROXY traffic.
+
+#  TAG: http_access
+#       Allowing or Denying access based on defined access lists
+#
+#       To allow or deny a message received on an HTTP, HTTPS, or FTP port:
+#       http_access allow|deny [!]aclname ...
+#
+#       NOTE on default values:
+#
+#       If there are no "access" lines present, the default is to deny
+#       the request.
+#
+#       If none of the "access" lines cause a match, the default is the
+#       opposite of the last line in the list.  If the last line was
+#       deny, the default is allow.  Conversely, if the last line
+#       is allow, the default will be deny.  For these reasons, it is a
+#       good idea to have an "deny all" entry at the end of your access
+#       lists to avoid potential confusion.
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#Default:
+# Deny, unless rules exist in squid.conf.
+#
+
+#
+# Recommended minimum Access Permission configuration:
+#
+# Deny requests to certain unsafe ports
+http_access deny !Safe_ports
+
+# Deny CONNECT to other than secure SSL ports
+http_access deny CONNECT !SSL_ports
+
+# Only allow cachemgr access from localhost
+http_access allow localhost manager
+http_access deny manager
+
+# We strongly recommend the following be uncommented to protect innocent
+# web applications running on the proxy server who think the only
+# one who can access services on "localhost" is a local user
+#http_access deny to_localhost
+
+#
+# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
+#
+
+# Example rule allowing access from your local networks.
+# Adapt localnet in the ACL section to list your (internal) IP networks
+# from where browsing should be allowed
+http_access allow localnet
+http_access allow localhost
+
+# And finally deny all other access to this proxy
+http_access deny all
+
+#  TAG: adapted_http_access
+#       Allowing or Denying access based on defined access lists
+#
+#       Essentially identical to http_access, but runs after redirectors
+#       and ICAP/eCAP adaptation. Allowing access control based on their
+#       output.
+#
+#       If not set then only http_access is used.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: http_reply_access
+#       Allow replies to client requests. This is complementary to http_access.
+#
+#       http_reply_access allow|deny [!] aclname ...
+#
+#       NOTE: if there are no access lines present, the default is to allow
+#       all replies.
+#
+#       If none of the access lines cause a match the opposite of the
+#       last line will apply. Thus it is good practice to end the rules
+#       with an "allow all" or "deny all" entry.
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: icp_access
+#       Allowing or Denying access to the ICP port based on defined
+#       access lists
+#
+#       icp_access  allow|deny [!]aclname ...
+#
+#       NOTE: The default if no icp_access lines are present is to
+#       deny all traffic. This default may cause problems with peers
+#       using ICP.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+## Allow ICP queries from local networks only
+##icp_access allow localnet
+##icp_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: htcp_access
+#       Allowing or Denying access to the HTCP port based on defined
+#       access lists
+#
+#       htcp_access  allow|deny [!]aclname ...
+#
+#       See also htcp_clr_access for details on access control for
+#       cache purge (CLR) HTCP messages.
+#
+#       NOTE: The default if no htcp_access lines are present is to
+#       deny all traffic. This default may cause problems with peers
+#       using the htcp option.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+## Allow HTCP queries from local networks only
+##htcp_access allow localnet
+##htcp_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: htcp_clr_access
+#       Allowing or Denying access to purge content using HTCP based
+#       on defined access lists.
+#       See htcp_access for details on general HTCP access control.
+#
+#       htcp_clr_access  allow|deny [!]aclname ...
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+## Allow HTCP CLR requests from trusted peers
+#acl htcp_clr_peer src 192.0.2.2 2001:DB8::2
+#htcp_clr_access allow htcp_clr_peer
+#htcp_clr_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: miss_access
+#       Determines whether network access is permitted when satisfying a request.
+#
+#       For example;
+#           to force your neighbors to use you as a sibling instead of
+#           a parent.
+#
+#               acl localclients src 192.0.2.0/24 2001:DB8::a:0/64
+#               miss_access deny  !localclients
+#               miss_access allow all
+#
+#       This means only your local clients are allowed to fetch relayed/MISS
+#       replies from the network and all other clients can only fetch cached
+#       objects (HITs).
+#
+#       The default for this setting allows all clients who passed the
+#       http_access rules to relay via this proxy.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: ident_lookup_access
+#       A list of ACL elements which, if matched, cause an ident
+#       (RFC 931) lookup to be performed for this request.  For
+#       example, you might choose to always perform ident lookups
+#       for your main multi-user Unix boxes, but not for your Macs
+#       and PCs.  By default, ident lookups are not performed for
+#       any requests.
+#
+#       To enable ident lookups for specific client addresses, you
+#       can follow this example:
+#
+#       acl ident_aware_hosts src 198.168.1.0/24
+#       ident_lookup_access allow ident_aware_hosts
+#       ident_lookup_access deny all
+#
+#       Only src type ACL checks are fully supported.  A srcdomain
+#       ACL might work at times, but it will not always provide
+#       the correct result.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Unless rules exist in squid.conf, IDENT is not fetched.
+
+#  TAG: reply_body_max_size     size [acl acl...]
+#       This option specifies the maximum size of a reply body. It can be
+#       used to prevent users from downloading very large files, such as
+#       MP3's and movies. When the reply headers are received, the
+#       reply_body_max_size lines are processed, and the first line where
+#       all (if any) listed ACLs are true is used as the maximum body size
+#       for this reply.
+#
+#       This size is checked twice. First when we get the reply headers,
+#       we check the content-length value.  If the content length value exists
+#       and is larger than the allowed size, the request is denied and the
+#       user receives an error message that says "the request or reply
+#       is too large." If there is no content-length, and the reply
+#       size exceeds this limit, the client's connection is just closed
+#       and they will receive a partial reply.
+#
+#       WARNING: downstream caches probably can not detect a partial reply
+#       if there is no content-length header, so they will cache
+#       partial responses and give them out as hits.  You should NOT
+#       use this option if you have downstream caches.
+#
+#       WARNING: A maximum size smaller than the size of squid's error messages
+#       will cause an infinite loop and crash squid. Ensure that the smallest
+#       non-zero value you use is greater that the maximum header size plus
+#       the size of your largest error page.
+#
+#       If you set this parameter none (the default), there will be
+#       no limit imposed.
+#
+#       Configuration Format is:
+#               reply_body_max_size SIZE UNITS [acl ...]
+#       ie.
+#               reply_body_max_size 10 MB
+#
+#Default:
+# No limit is applied.
+
+# NETWORK OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: http_port
+#       Usage:  port [mode] [options]
+#               hostname:port [mode] [options]
+#               1.2.3.4:port [mode] [options]
+#
+#       The socket addresses where Squid will listen for HTTP client
+#       requests.  You may specify multiple socket addresses.
+#       There are three forms: port alone, hostname with port, and
+#       IP address with port.  If you specify a hostname or IP
+#       address, Squid binds the socket to that specific
+#       address. Most likely, you do not need to bind to a specific
+#       address, so you can use the port number alone.
+#
+#       If you are running Squid in accelerator mode, you
+#       probably want to listen on port 80 also, or instead.
+#
+#       The -a command line option may be used to specify additional
+#       port(s) where Squid listens for proxy request. Such ports will
+#       be plain proxy ports with no options.
+#
+#       You may specify multiple socket addresses on multiple lines.
+#
+#       Modes:
+#
+#          intercept    Support for IP-Layer NAT interception delivering
+#                       traffic to this Squid port.
+#                       NP: disables authentication on the port.
+#
+#          tproxy       Support Linux TPROXY (or BSD divert-to) with spoofing
+#                       of outgoing connections using the client IP address.
+#                       NP: disables authentication on the port.
+#
+#          accel        Accelerator / reverse proxy mode
+#
+#          ssl-bump     For each CONNECT request allowed by ssl_bump ACLs,
+#                       establish secure connection with the client and with
+#                       the server, decrypt HTTPS messages as they pass through
+#                       Squid, and treat them as unencrypted HTTP messages,
+#                       becoming the man-in-the-middle.
+#
+#                       The ssl_bump option is required to fully enable
+#                       bumping of CONNECT requests.
+#
+#       Omitting the mode flag causes default forward proxy mode to be used.
+#
+#
+#       Accelerator Mode Options:
+#
+#          defaultsite=domainname
+#                       What to use for the Host: header if it is not present
+#                       in a request. Determines what site (not origin server)
+#                       accelerators should consider the default.
+#
+#          no-vhost     Disable using HTTP/1.1 Host header for virtual domain support.
+#
+#          protocol=    Protocol to reconstruct accelerated and intercepted
+#                       requests with. Defaults to HTTP/1.1 for http_port and
+#                       HTTPS/1.1 for https_port.
+#                       When an unsupported value is configured Squid will
+#                       produce a FATAL error.
+#                       Values: HTTP or HTTP/1.1, HTTPS or HTTPS/1.1
+#
+#          vport        Virtual host port support. Using the http_port number
+#                       instead of the port passed on Host: headers.
+#
+#          vport=NN     Virtual host port support. Using the specified port
+#                       number instead of the port passed on Host: headers.
+#
+#          act-as-origin
+#                       Act as if this Squid is the origin server.
+#                       This currently means generate new Date: and Expires:
+#                       headers on HIT instead of adding Age:.
+#
+#          ignore-cc    Ignore request Cache-Control headers.
+#
+#                       WARNING: This option violates HTTP specifications if
+#                       used in non-accelerator setups.
+#
+#          allow-direct Allow direct forwarding in accelerator mode. Normally
+#                       accelerated requests are denied direct forwarding as if
+#                       never_direct was used.
+#
+#                       WARNING: this option opens accelerator mode to security
+#                       vulnerabilities usually only affecting in interception
+#                       mode. Make sure to protect forwarding with suitable
+#                       http_access rules when using this.
+#
+#
+#       SSL Bump Mode Options:
+#           In addition to these options ssl-bump requires TLS/SSL options.
+#
+#          generate-host-certificates[=<on|off>]
+#                       Dynamically create SSL server certificates for the
+#                       destination hosts of bumped CONNECT requests.When
+#                       enabled, the cert and key options are used to sign
+#                       generated certificates. Otherwise generated
+#                       certificate will be selfsigned.
+#                       If there is a CA certificate lifetime of the generated
+#                       certificate equals lifetime of the CA certificate. If
+#                       generated certificate is selfsigned lifetime is three
+#                       years.
+#                       This option is disabled by default. See the ssl-bump
+#                       option above for more information.
+#
+#          dynamic_cert_mem_cache_size=SIZE
+#                       Approximate total RAM size spent on cached generated
+#                       certificates. If set to zero, caching is disabled.
+#
+#       TLS / SSL Options:
+#
+#          cert=        Path to SSL certificate (PEM format).
+#
+#          key=         Path to SSL private key file (PEM format)
+#                       if not specified, the certificate file is
+#                       assumed to be a combined certificate and
+#                       key file.
+#
+#          version=     The version of SSL/TLS supported
+#                           1   automatic (default)
+#                           2   SSLv2 only
+#                           3   SSLv3 only
+#                           4   TLSv1.0 only
+#                           5   TLSv1.1 only
+#                           6   TLSv1.2 only
+#
+#          cipher=      Colon separated list of supported ciphers.
+#                       NOTE: some ciphers such as EDH ciphers depend on
+#                             additional settings. If those settings are
+#                             omitted the ciphers may be silently ignored
+#                             by the OpenSSL library.
+#
+#          options=     Various SSL implementation options. The most important
+#                       being:
+#                           NO_SSLv2    Disallow the use of SSLv2
+#                           NO_SSLv3    Disallow the use of SSLv3
+#                           NO_TLSv1    Disallow the use of TLSv1.0
+#                           NO_TLSv1_1  Disallow the use of TLSv1.1
+#                           NO_TLSv1_2  Disallow the use of TLSv1.2
+#                           SINGLE_DH_USE Always create a new key when using
+#                                     temporary/ephemeral DH key exchanges
+#                           NO_TICKET Disables TLS tickets extension
+#
+#                           SINGLE_ECDH_USE
+#                                     Enable ephemeral ECDH key exchange.
+#                                     The adopted curve should be specified
+#                                     using the tls-dh option.
+#
+#                           ALL       Enable various bug workarounds
+#                                     suggested as "harmless" by OpenSSL
+#                                     Be warned that this reduces SSL/TLS
+#                                     strength to some attacks.
+#                       See OpenSSL SSL_CTX_set_options documentation for a
+#                       complete list of options.
+#
+#          clientca=    File containing the list of CAs to use when
+#                       requesting a client certificate.
+#
+#          cafile=      File containing additional CA certificates to
+#                       use when verifying client certificates. If unset
+#                       clientca will be used.
+#
+#          capath=      Directory containing additional CA certificates
+#                       and CRL lists to use when verifying client certificates.
+#
+#          crlfile=     File of additional CRL lists to use when verifying
+#                       the client certificate, in addition to CRLs stored in
+#                       the capath. Implies VERIFY_CRL flag below.
+#
+#          tls-dh=[curve:]file
+#                       File containing DH parameters for temporary/ephemeral DH key
+#                       exchanges, optionally prefixed by a curve for ephemeral ECDH
+#                       key exchanges.
+#                       See OpenSSL documentation for details on how to create the
+#                       DH parameter file. Supported curves for ECDH can be listed
+#                       using the "openssl ecparam -list_curves" command.
+#                       WARNING: EDH and EECDH ciphers will be silently disabled if
+#                                this option is not set.
+#
+#          sslflags=    Various flags modifying the use of SSL:
+#                           DELAYED_AUTH
+#                               Don't request client certificates
+#                               immediately, but wait until acl processing
+#                               requires a certificate (not yet implemented).
+#                           NO_DEFAULT_CA
+#                               Don't use the default CA lists built in
+#                               to OpenSSL.
+#                           NO_SESSION_REUSE
+#                               Don't allow for session reuse. Each connection
+#                               will result in a new SSL session.
+#                           VERIFY_CRL
+#                               Verify CRL lists when accepting client
+#                               certificates.
+#                           VERIFY_CRL_ALL
+#                               Verify CRL lists for all certificates in the
+#                               client certificate chain.
+#
+#          sslcontext=  SSL session ID context identifier.
+#
+#       Other Options:
+#
+#          connection-auth[=on|off]
+#                       use connection-auth=off to tell Squid to prevent
+#                       forwarding Microsoft connection oriented authentication
+#                       (NTLM, Negotiate and Kerberos)
+#
+#          disable-pmtu-discovery=
+#                       Control Path-MTU discovery usage:
+#                           off         lets OS decide on what to do (default).
+#                           transparent disable PMTU discovery when transparent
+#                                       support is enabled.
+#                           always      disable always PMTU discovery.
+#
+#                       In many setups of transparently intercepting proxies
+#                       Path-MTU discovery can not work on traffic towards the
+#                       clients. This is the case when the intercepting device
+#                       does not fully track connections and fails to forward
+#                       ICMP must fragment messages to the cache server. If you
+#                       have such setup and experience that certain clients
+#                       sporadically hang or never complete requests set
+#                       disable-pmtu-discovery option to 'transparent'.
+#
+#          name=        Specifies a internal name for the port. Defaults to
+#                       the port specification (port or addr:port)
+#
+#          tcpkeepalive[=idle,interval,timeout]
+#                       Enable TCP keepalive probes of idle connections.
+#                       In seconds; idle is the initial time before TCP starts
+#                       probing the connection, interval how often to probe, and
+#                       timeout the time before giving up.
+#
+#          require-proxy-header
+#                       Require PROXY protocol version 1 or 2 connections.
+#                       The proxy_protocol_access is required to whitelist
+#                       downstream proxies which can be trusted.
+#
+#       If you run Squid on a dual-homed machine with an internal
+#       and an external interface we recommend you to specify the
+#       internal address:port in http_port. This way Squid will only be
+#       visible on the internal address.
+#
+#
+
+# Squid normally listens to port 3128
+http_port 3128
+
+#  TAG: https_port
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Usage:  [ip:]port cert=certificate.pem [key=key.pem] [mode] [options...]
+#
+#       The socket address where Squid will listen for client requests made
+#       over TLS or SSL connections. Commonly referred to as HTTPS.
+#
+#       This is most useful for situations where you are running squid in
+#       accelerator mode and you want to do the SSL work at the accelerator level.
+#
+#       You may specify multiple socket addresses on multiple lines,
+#       each with their own SSL certificate and/or options.
+#
+#       Modes:
+#
+#          accel        Accelerator / reverse proxy mode
+#
+#          intercept    Support for IP-Layer interception of
+#                       outgoing requests without browser settings.
+#                       NP: disables authentication and IPv6 on the port.
+#
+#          tproxy       Support Linux TPROXY for spoofing outgoing
+#                       connections using the client IP address.
+#                       NP: disables authentication and maybe IPv6 on the port.
+#
+#          ssl-bump     For each intercepted connection allowed by ssl_bump
+#                       ACLs, establish a secure connection with the client and with
+#                       the server, decrypt HTTPS messages as they pass through
+#                       Squid, and treat them as unencrypted HTTP messages,
+#                       becoming the man-in-the-middle.
+#
+#                       An "ssl_bump server-first" match is required to
+#                       fully enable bumping of intercepted SSL connections.
+#
+#                       Requires tproxy or intercept.
+#
+#       Omitting the mode flag causes default forward proxy mode to be used.
+#
+#
+#       See http_port for a list of generic options
+#
+#
+#       SSL Options:
+#
+#          cert=        Path to SSL certificate (PEM format).
+#
+#          key=         Path to SSL private key file (PEM format)
+#                       if not specified, the certificate file is
+#                       assumed to be a combined certificate and
+#                       key file.
+#
+#          version=     The version of SSL/TLS supported
+#                           1   automatic (default)
+#                           2   SSLv2 only
+#                           3   SSLv3 only
+#                           4   TLSv1 only
+#
+#          cipher=      Colon separated list of supported ciphers.
+#
+#          options=     Various SSL engine options. The most important
+#                       being:
+#                           NO_SSLv2  Disallow the use of SSLv2
+#                           NO_SSLv3  Disallow the use of SSLv3
+#                           NO_TLSv1  Disallow the use of TLSv1
+#
+#                           SINGLE_DH_USE Always create a new key when using
+#                                     temporary/ephemeral DH key exchanges
+#
+#                           SINGLE_ECDH_USE
+#                                     Enable ephemeral ECDH key exchange.
+#                                     The adopted curve should be specified
+#                                     using the tls-dh option.
+#
+#                       See src/ssl_support.c or OpenSSL SSL_CTX_set_options
+#                       documentation for a complete list of options.
+#
+#          clientca=    File containing the list of CAs to use when
+#                       requesting a client certificate.
+#
+#          cafile=      File containing additional CA certificates to
+#                       use when verifying client certificates. If unset
+#                       clientca will be used.
+#
+#          capath=      Directory containing additional CA certificates
+#                       and CRL lists to use when verifying client certificates.
+#
+#          crlfile=     File of additional CRL lists to use when verifying
+#                       the client certificate, in addition to CRLs stored in
+#                       the capath. Implies VERIFY_CRL flag below.
+#
+#          tls-dh=[curve:]file
+#                       File containing DH parameters for temporary/ephemeral DH key
+#                       exchanges, optionally prefixed by a curve for ephemeral ECDH
+#                       key exchanges.
+#
+#          sslflags=    Various flags modifying the use of SSL:
+#                           DELAYED_AUTH
+#                               Don't request client certificates
+#                               immediately, but wait until acl processing
+#                               requires a certificate (not yet implemented).
+#                           NO_DEFAULT_CA
+#                               Don't use the default CA lists built in
+#                               to OpenSSL.
+#                           NO_SESSION_REUSE
+#                               Don't allow for session reuse. Each connection
+#                               will result in a new SSL session.
+#                           VERIFY_CRL
+#                               Verify CRL lists when accepting client
+#                               certificates.
+#                           VERIFY_CRL_ALL
+#                               Verify CRL lists for all certificates in the
+#                               client certificate chain.
+#
+#          sslcontext=  SSL session ID context identifier.
+#
+#          generate-host-certificates[=<on|off>]
+#                       Dynamically create SSL server certificates for the
+#                       destination hosts of bumped SSL requests.When
+#                       enabled, the cert and key options are used to sign
+#                       generated certificates. Otherwise generated
+#                       certificate will be selfsigned.
+#                       If there is CA certificate life time of generated
+#                       certificate equals lifetime of CA certificate. If
+#                       generated certificate is selfsigned lifetime is three
+#                       years.
+#                       This option is disabled by default. See the ssl-bump
+#                       option above for more information.
+#
+#          dynamic_cert_mem_cache_size=SIZE
+#                       Approximate total RAM size spent on cached generated
+#                       certificates. If set to zero, caching is disabled.
+#
+#       See http_port for a list of available options.
+#Default:
+# none
+
+#  TAG: ftp_port
+#       Enables Native FTP proxy by specifying the socket address where Squid
+#       listens for FTP client requests. See http_port directive for various
+#       ways to specify the listening address and mode.
+#
+#       Usage: ftp_port address [mode] [options]
+#
+#       WARNING: This is a new, experimental, complex feature that has seen
+#       limited production exposure. Some Squid modules (e.g., caching) do not
+#       currently work with native FTP proxying, and many features have not
+#       even been tested for compatibility. Test well before deploying!
+#
+#       Native FTP proxying differs substantially from proxying HTTP requests
+#       with ftp:// URIs because Squid works as an FTP server and receives
+#       actual FTP commands (rather than HTTP requests with FTP URLs).
+#
+#       Native FTP commands accepted at ftp_port are internally converted or
+#       wrapped into HTTP-like messages. The same happens to Native FTP
+#       responses received from FTP origin servers. Those HTTP-like messages
+#       are shoveled through regular access control and adaptation layers
+#       between the FTP client and the FTP origin server. This allows Squid to
+#       examine, adapt, block, and log FTP exchanges. Squid reuses most HTTP
+#       mechanisms when shoveling wrapped FTP messages. For example,
+#       http_access and adaptation_access directives are used.
+#
+#       Modes:
+#
+#          intercept    Same as http_port intercept. The FTP origin address is
+#                       determined based on the intended destination of the
+#                       intercepted connection.
+#
+#          tproxy       Support Linux TPROXY for spoofing outgoing
+#                       connections using the client IP address.
+#                       NP: disables authentication and maybe IPv6 on the port.
+#
+#       By default (i.e., without an explicit mode option), Squid extracts the
+#       FTP origin address from the login@origin parameter of the FTP USER
+#       command. Many popular FTP clients support such native FTP proxying.
+#
+#       Options:
+#
+#          name=token   Specifies an internal name for the port. Defaults to
+#                       the port address. Usable with myportname ACL.
+#
+#          ftp-track-dirs
+#                       Enables tracking of FTP directories by injecting extra
+#                       PWD commands and adjusting Request-URI (in wrapping
+#                       HTTP requests) to reflect the current FTP server
+#                       directory. Tracking is disabled by default.
+#
+#          protocol=FTP Protocol to reconstruct accelerated and intercepted
+#                       requests with. Defaults to FTP. No other accepted
+#                       values have been tested with. An unsupported value
+#                       results in a FATAL error. Accepted values are FTP,
+#                       HTTP (or HTTP/1.1), and HTTPS (or HTTPS/1.1).
+#
+#       Other http_port modes and options that are not specific to HTTP and
+#       HTTPS may also work.
+#Default:
+# none
+
+#  TAG: tcp_outgoing_tos
+#       Allows you to select a TOS/Diffserv value for packets outgoing
+#       on the server side, based on an ACL.
+#
+#       tcp_outgoing_tos ds-field [!]aclname ...
+#
+#       Example where normal_service_net uses the TOS value 0x00
+#       and good_service_net uses 0x20
+#
+#       acl normal_service_net src 10.0.0.0/24
+#       acl good_service_net src 10.0.1.0/24
+#       tcp_outgoing_tos 0x00 normal_service_net
+#       tcp_outgoing_tos 0x20 good_service_net
+#
+#       TOS/DSCP values really only have local significance - so you should
+#       know what you're specifying. For more information, see RFC2474,
+#       RFC2475, and RFC3260.
+#
+#       The TOS/DSCP byte must be exactly that - a octet value  0 - 255, or
+#       "default" to use whatever default your host has.
+#       Note that only multiples of 4 are usable as the two rightmost bits have
+#       been redefined for use by ECN (RFC 3168 section 23.1).
+#       The squid parser will enforce this by masking away the ECN bits.
+#
+#       Processing proceeds in the order specified, and stops at first fully
+#       matching line.
+#
+#       Only fast ACLs are supported.
+#Default:
+# none
+
+#  TAG: clientside_tos
+#       Allows you to select a TOS/DSCP value for packets being transmitted
+#       on the client-side, based on an ACL.
+#
+#       clientside_tos ds-field [!]aclname ...
+#
+#       Example where normal_service_net uses the TOS value 0x00
+#       and good_service_net uses 0x20
+#
+#       acl normal_service_net src 10.0.0.0/24
+#       acl good_service_net src 10.0.1.0/24
+#       clientside_tos 0x00 normal_service_net
+#       clientside_tos 0x20 good_service_net
+#
+#       Note: This feature is incompatible with qos_flows. Any TOS values set here
+#       will be overwritten by TOS values in qos_flows.
+#
+#       The TOS/DSCP byte must be exactly that - a octet value  0 - 255, or
+#       "default" to use whatever default your host has.
+#       Note that only multiples of 4 are usable as the two rightmost bits have
+#       been redefined for use by ECN (RFC 3168 section 23.1).
+#       The squid parser will enforce this by masking away the ECN bits.
+#
+#Default:
+# none
+
+#  TAG: tcp_outgoing_mark
+# Note: This option is only available if Squid is rebuilt with the
+#       Packet MARK (Linux)
+#
+#       Allows you to apply a Netfilter mark value to outgoing packets
+#       on the server side, based on an ACL.
+#
+#       tcp_outgoing_mark mark-value [!]aclname ...
+#
+#       Example where normal_service_net uses the mark value 0x00
+#       and good_service_net uses 0x20
+#
+#       acl normal_service_net src 10.0.0.0/24
+#       acl good_service_net src 10.0.1.0/24
+#       tcp_outgoing_mark 0x00 normal_service_net
+#       tcp_outgoing_mark 0x20 good_service_net
+#
+#       Only fast ACLs are supported.
+#Default:
+# none
+
+#  TAG: clientside_mark
+# Note: This option is only available if Squid is rebuilt with the
+#       Packet MARK (Linux)
+#
+#       Allows you to apply a Netfilter mark value to packets being transmitted
+#       on the client-side, based on an ACL.
+#
+#       clientside_mark mark-value [!]aclname ...
+#
+#       Example where normal_service_net uses the mark value 0x00
+#       and good_service_net uses 0x20
+#
+#       acl normal_service_net src 10.0.0.0/24
+#       acl good_service_net src 10.0.1.0/24
+#       clientside_mark 0x00 normal_service_net
+#       clientside_mark 0x20 good_service_net
+#
+#       Note: This feature is incompatible with qos_flows. Any mark values set here
+#       will be overwritten by mark values in qos_flows.
+#Default:
+# none
+
+#  TAG: qos_flows
+#       Allows you to select a TOS/DSCP value to mark outgoing
+#       connections to the client, based on where the reply was sourced.
+#       For platforms using netfilter, allows you to set a netfilter mark
+#       value instead of, or in addition to, a TOS value.
+#
+#       By default this functionality is disabled. To enable it with the default
+#       settings simply use "qos_flows mark" or "qos_flows tos". Default
+#       settings will result in the netfilter mark or TOS value being copied
+#       from the upstream connection to the client. Note that it is the connection
+#       CONNMARK value not the packet MARK value that is copied.
+#
+#       It is not currently possible to copy the mark or TOS value from the
+#       client to the upstream connection request.
+#
+#       TOS values really only have local significance - so you should
+#       know what you're specifying. For more information, see RFC2474,
+#       RFC2475, and RFC3260.
+#
+#       The TOS/DSCP byte must be exactly that - a octet value  0 - 255.
+#       Note that only multiples of 4 are usable as the two rightmost bits have
+#       been redefined for use by ECN (RFC 3168 section 23.1).
+#       The squid parser will enforce this by masking away the ECN bits.
+#
+#       Mark values can be any unsigned 32-bit integer value.
+#
+#       This setting is configured by setting the following values:
+#
+#       tos|mark                Whether to set TOS or netfilter mark values
+#
+#       local-hit=0xFF          Value to mark local cache hits.
+#
+#       sibling-hit=0xFF        Value to mark hits from sibling peers.
+#
+#       parent-hit=0xFF         Value to mark hits from parent peers.
+#
+#       miss=0xFF[/mask]        Value to mark cache misses. Takes precedence
+#                               over the preserve-miss feature (see below), unless
+#                               mask is specified, in which case only the bits
+#                               specified in the mask are written.
+#
+#       The TOS variant of the following features are only possible on Linux
+#       and require your kernel to be patched with the TOS preserving ZPH
+#       patch, available from http://zph.bratcheda.org
+#       No patch is needed to preserve the netfilter mark, which will work
+#       with all variants of netfilter.
+#
+#       disable-preserve-miss
+#               This option disables the preservation of the TOS or netfilter
+#               mark. By default, the existing TOS or netfilter mark value of
+#               the response coming from the remote server will be retained
+#               and masked with miss-mark.
+#               NOTE: in the case of a netfilter mark, the mark must be set on
+#               the connection (using the CONNMARK target) not on the packet
+#               (MARK target).
+#
+#       miss-mask=0xFF
+#               Allows you to mask certain bits in the TOS or mark value
+#               received from the remote server, before copying the value to
+#               the TOS sent towards clients.
+#               Default for tos: 0xFF (TOS from server is not changed).
+#               Default for mark: 0xFFFFFFFF (mark from server is not changed).
+#
+#       All of these features require the --enable-zph-qos compilation flag
+#       (enabled by default). Netfilter marking also requires the
+#       libnetfilter_conntrack libraries (--with-netfilter-conntrack) and
+#       libcap 2.09+ (--with-libcap).
+#
+#Default:
+# none
+
+#  TAG: tcp_outgoing_address
+#       Allows you to map requests to different outgoing IP addresses
+#       based on the username or source address of the user making
+#       the request.
+#
+#       tcp_outgoing_address ipaddr [[!]aclname] ...
+#
+#       For example;
+#               Forwarding clients with dedicated IPs for certain subnets.
+#
+#         acl normal_service_net src 10.0.0.0/24
+#         acl good_service_net src 10.0.2.0/24
+#
+#         tcp_outgoing_address 2001:db8::c001 good_service_net
+#         tcp_outgoing_address 10.1.0.2 good_service_net
+#
+#         tcp_outgoing_address 2001:db8::beef normal_service_net
+#         tcp_outgoing_address 10.1.0.1 normal_service_net
+#
+#         tcp_outgoing_address 2001:db8::1
+#         tcp_outgoing_address 10.1.0.3
+#
+#       Processing proceeds in the order specified, and stops at first fully
+#       matching line.
+#
+#       Squid will add an implicit IP version test to each line.
+#       Requests going to IPv4 websites will use the outgoing 10.1.0.* addresses.
+#       Requests going to IPv6 websites will use the outgoing 2001:db8:* addresses.
+#
+#
+#       NOTE: The use of this directive using client dependent ACLs is
+#       incompatible with the use of server side persistent connections. To
+#       ensure correct results it is best to set server_persistent_connections
+#       to off when using this directive in such configurations.
+#
+#       NOTE: The use of this directive to set a local IP on outgoing TCP links
+#       is incompatible with using TPROXY to set client IP out outbound TCP links.
+#       When needing to contact peers use the no-tproxy cache_peer option and the
+#       client_dst_passthru directive re-enable normal forwarding such as this.
+#
+#Default:
+# Address selection is performed by the operating system.
+
+#  TAG: host_verify_strict
+#       Regardless of this option setting, when dealing with intercepted
+#       traffic, Squid always verifies that the destination IP address matches
+#       the Host header domain or IP (called 'authority form URL').
+#
+#       This enforcement is performed to satisfy a MUST-level requirement in
+#       RFC 2616 section 14.23: "The Host field value MUST represent the naming
+#       authority of the origin server or gateway given by the original URL".
+#
+#       When set to ON:
+#               Squid always responds with an HTTP 409 (Conflict) error
+#               page and logs a security warning if there is no match.
+#
+#               Squid verifies that the destination IP address matches
+#               the Host header for forward-proxy and reverse-proxy traffic
+#               as well. For those traffic types, Squid also enables the
+#               following checks, comparing the corresponding Host header
+#               and Request-URI components:
+#
+#                * The host names (domain or IP) must be identical,
+#                  but valueless or missing Host header disables all checks.
+#                  For the two host names to match, both must be either IP
+#                  or FQDN.
+#
+#                * Port numbers must be identical, but if a port is missing
+#                  the scheme-default port is assumed.
+#
+#
+#       When set to OFF (the default):
+#               Squid allows suspicious requests to continue but logs a
+#               security warning and blocks caching of the response.
+#
+#                * Forward-proxy traffic is not checked at all.
+#
+#                * Reverse-proxy traffic is not checked at all.
+#
+#                * Intercepted traffic which passes verification is handled
+#                  according to client_dst_passthru.
+#
+#                * Intercepted requests which fail verification are sent
+#                  to the client original destination instead of DIRECT.
+#                  This overrides 'client_dst_passthru off'.
+#
+#               For now suspicious intercepted CONNECT requests are always
+#               responded to with an HTTP 409 (Conflict) error page.
+#
+#
+#       SECURITY NOTE:
+#
+#       As described in CVE-2009-0801 when the Host: header alone is used
+#       to determine the destination of a request it becomes trivial for
+#       malicious scripts on remote websites to bypass browser same-origin
+#       security policy and sandboxing protections.
+#
+#       The cause of this is that such applets are allowed to perform their
+#       own HTTP stack, in which case the same-origin policy of the browser
+#       sandbox only verifies that the applet tries to contact the same IP
+#       as from where it was loaded at the IP level. The Host: header may
+#       be different from the connected IP and approved origin.
+#
+#Default:
+# host_verify_strict off
+
+#  TAG: client_dst_passthru
+#       With NAT or TPROXY intercepted traffic Squid may pass the request
+#       directly to the original client destination IP or seek a faster
+#       source using the HTTP Host header.
+#
+#       Using Host to locate alternative servers can provide faster
+#       connectivity with a range of failure recovery options.
+#       But can also lead to connectivity trouble when the client and
+#       server are attempting stateful interactions unaware of the proxy.
+#
+#       This option (on by default) prevents alternative DNS entries being
+#       located to send intercepted traffic DIRECT to an origin server.
+#       The clients original destination IP and port will be used instead.
+#
+#       Regardless of this option setting, when dealing with intercepted
+#       traffic Squid will verify the Host: header and any traffic which
+#       fails Host verification will be treated as if this option were ON.
+#
+#       see host_verify_strict for details on the verification process.
+#Default:
+# client_dst_passthru on
+
+# SSL OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: ssl_unclean_shutdown
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Some browsers (especially MSIE) bugs out on SSL shutdown
+#       messages.
+#Default:
+# ssl_unclean_shutdown off
+
+#  TAG: ssl_engine
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       The OpenSSL engine to use. You will need to set this if you
+#       would like to use hardware SSL acceleration for example.
+#Default:
+# none
+
+#  TAG: sslproxy_client_certificate
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Client SSL Certificate to use when proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_client_key
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Client SSL Key to use when proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_version
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       SSL version level to use when proxying https:// URLs
+#
+#       The versions of SSL/TLS supported:
+#
+#           1   automatic (default)
+#           2   SSLv2 only
+#           3   SSLv3 only
+#           4   TLSv1.0 only
+#           5   TLSv1.1 only
+#           6   TLSv1.2 only
+#Default:
+# automatic SSL/TLS version negotiation
+
+#  TAG: sslproxy_options
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Colon (:) or comma (,) separated list of SSL implementation options
+#       to use when proxying https:// URLs
+#
+#       The most important being:
+#
+#           NO_SSLv2    Disallow the use of SSLv2
+#           NO_SSLv3    Disallow the use of SSLv3
+#           NO_TLSv1    Disallow the use of TLSv1.0
+#           NO_TLSv1_1  Disallow the use of TLSv1.1
+#           NO_TLSv1_2  Disallow the use of TLSv1.2
+#
+#           SINGLE_DH_USE
+#                     Always create a new key when using temporary/ephemeral
+#                     DH key exchanges
+#
+#           NO_TICKET
+#                     Disable use of RFC5077 session tickets. Some servers
+#                     may have problems understanding the TLS extension due
+#                     to ambiguous specification in RFC4507.
+#
+#           ALL       Enable various bug workarounds suggested as "harmless"
+#                     by OpenSSL. Be warned that this may reduce SSL/TLS
+#                     strength to some attacks.
+#
+#       See the OpenSSL SSL_CTX_set_options documentation for a
+#       complete list of possible options.
+#
+#       WARNING: This directive takes a single token. If a space is used
+#                the value(s) after that space are SILENTLY IGNORED.
+#Default:
+# none
+
+#  TAG: sslproxy_cipher
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       SSL cipher list to use when proxying https:// URLs
+#
+#       Colon separated list of supported ciphers.
+#Default:
+# none
+
+#  TAG: sslproxy_cafile
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       file containing CA certificates to use when verifying server
+#       certificates while proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_capath
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       directory containing CA certificates to use when verifying
+#       server certificates while proxying https:// URLs
+#Default:
+# none
+
+#  TAG: sslproxy_session_ttl
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Sets the timeout value for SSL sessions
+#Default:
+# sslproxy_session_ttl 300
+
+#  TAG: sslproxy_session_cache_size
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#        Sets the cache size to use for ssl session
+#Default:
+# sslproxy_session_cache_size 2 MB
+
+#  TAG: sslproxy_foreign_intermediate_certs
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Many origin servers fail to send their full server certificate
+#       chain for verification, assuming the client already has or can
+#       easily locate any missing intermediate certificates.
+#
+#       Squid uses the certificates from the specified file to fill in
+#       these missing chains when trying to validate origin server
+#       certificate chains.
+#
+#       The file is expected to contain zero or more PEM-encoded
+#       intermediate certificates. These certificates are not treated
+#       as trusted root certificates, and any self-signed certificate in
+#       this file will be ignored.
+#Default:
+# none
+
+#  TAG: sslproxy_cert_sign_hash
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Sets the hashing algorithm to use when signing generated certificates.
+#       Valid algorithm names depend on the OpenSSL library used. The following
+#       names are usually available: sha1, sha256, sha512, and md5. Please see
+#       your OpenSSL library manual for the available hashes. By default, Squids
+#       that support this option use sha256 hashes.
+#
+#       Squid does not forcefully purge cached certificates that were generated
+#       with an algorithm other than the currently configured one. They remain
+#       in the cache, subject to the regular cache eviction policy, and become
+#       useful if the algorithm changes again.
+#Default:
+# none
+
+#  TAG: ssl_bump
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       This option is consulted when a CONNECT request is received on
+#       an http_port (or a new connection is intercepted at an
+#       https_port), provided that port was configured with an ssl-bump
+#       flag. The subsequent data on the connection is either treated as
+#       HTTPS and decrypted OR tunneled at TCP level without decryption,
+#       depending on the first matching bumping "action".
+#
+#       ssl_bump <action> [!]acl ...
+#
+#       The following bumping actions are currently supported:
+#
+#           splice
+#               Become a TCP tunnel without decrypting proxied traffic.
+#               This is the default action.
+#
+#           bump
+#               When used on step SslBump1, establishes a secure connection
+#               with the client first, then connect to the server.
+#               When used on step SslBump2 or SslBump3, establishes a secure
+#               connection with the server and, using a mimicked server
+#               certificate, with the client.
+#
+#           peek
+#               Receive client (step SslBump1) or server (step SslBump2)
+#               certificate while preserving the possibility of splicing the
+#               connection. Peeking at the server certificate (during step 2)
+#               usually precludes bumping of the connection at step 3.
+#
+#           stare
+#               Receive client (step SslBump1) or server (step SslBump2)
+#               certificate while preserving the possibility of bumping the
+#               connection. Staring at the server certificate (during step 2)
+#               usually precludes splicing of the connection at step 3.
+#
+#           terminate
+#               Close client and server connections.
+#
+#       Backward compatibility actions available at step SslBump1:
+#
+#           client-first
+#               Bump the connection. Establish a secure connection with the
+#               client first, then connect to the server. This old mode does
+#               not allow Squid to mimic server SSL certificate and does not
+#               work with intercepted SSL connections.
+#
+#           server-first
+#               Bump the connection. Establish a secure connection with the
+#               server first, then establish a secure connection with the
+#               client, using a mimicked server certificate. Works with both
+#               CONNECT requests and intercepted SSL connections, but does
+#               not allow to make decisions based on SSL handshake info.
+#
+#           peek-and-splice
+#               Decide whether to bump or splice the connection based on
+#               client-to-squid and server-to-squid SSL hello messages.
+#               XXX: Remove.
+#
+#           none
+#               Same as the "splice" action.
+#
+#       All ssl_bump rules are evaluated at each of the supported bumping
+#       steps.  Rules with actions that are impossible at the current step are
+#       ignored. The first matching ssl_bump action wins and is applied at the
+#       end of the current step. If no rules match, the splice action is used.
+#       See the at_step ACL for a list of the supported SslBump steps.
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#       See also: http_port ssl-bump, https_port ssl-bump, and acl at_step.
+#
+#
+#       # Example: Bump all TLS connections except those originating from
+#       # localhost or those going to example.com.
+#
+#       acl broken_sites ssl::server_name .example.com
+#       ssl_bump splice localhost
+#       ssl_bump splice broken_sites
+#       ssl_bump bump all
+#Default:
+# Become a TCP tunnel without decrypting proxied traffic.
+
+#  TAG: sslproxy_flags
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Various flags modifying the use of SSL while proxying https:// URLs:
+#           DONT_VERIFY_PEER    Accept certificates that fail verification.
+#                               For refined control, see sslproxy_cert_error.
+#           NO_DEFAULT_CA       Don't use the default CA list built in
+#                               to OpenSSL.
+#Default:
+# none
+
+#  TAG: sslproxy_cert_error
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Use this ACL to bypass server certificate validation errors.
+#
+#       For example, the following lines will bypass all validation errors
+#       when talking to servers for example.com. All other
+#       validation errors will result in ERR_SECURE_CONNECT_FAIL error.
+#
+#               acl BrokenButTrustedServers dstdomain example.com
+#               sslproxy_cert_error allow BrokenButTrustedServers
+#               sslproxy_cert_error deny all
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#       Using slow acl types may result in server crashes
+#
+#       Without this option, all server certificate validation errors
+#       terminate the transaction to protect Squid and the client.
+#
+#       SQUID_X509_V_ERR_INFINITE_VALIDATION error cannot be bypassed
+#       but should not happen unless your OpenSSL library is buggy.
+#
+#       SECURITY WARNING:
+#               Bypassing validation errors is dangerous because an
+#               error usually implies that the server cannot be trusted
+#               and the connection may be insecure.
+#
+#       See also: sslproxy_flags and DONT_VERIFY_PEER.
+#Default:
+# Server certificate errors terminate the transaction.
+
+#  TAG: sslproxy_cert_sign
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#
+#        sslproxy_cert_sign <signing algorithm> acl ...
+#
+#        The following certificate signing algorithms are supported:
+#
+#          signTrusted
+#               Sign using the configured CA certificate which is usually
+#               placed in and trusted by end-user browsers. This is the
+#               default for trusted origin server certificates.
+#
+#          signUntrusted
+#               Sign to guarantee an X509_V_ERR_CERT_UNTRUSTED browser error.
+#               This is the default for untrusted origin server certificates
+#               that are not self-signed (see ssl::certUntrusted).
+#
+#          signSelf
+#               Sign using a self-signed certificate with the right CN to
+#               generate a X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT error in the
+#               browser. This is the default for self-signed origin server
+#               certificates (see ssl::certSelfSigned).
+#
+#       This clause only supports fast acl types.
+#
+#       When sslproxy_cert_sign acl(s) match, Squid uses the corresponding
+#       signing algorithm to generate the certificate and ignores all
+#       subsequent sslproxy_cert_sign options (the first match wins). If no
+#       acl(s) match, the default signing algorithm is determined by errors
+#       detected when obtaining and validating the origin server certificate.
+#
+#       WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
+#       be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
+#       CONNECT request that carries a domain name. In all other cases (CONNECT
+#       to an IP address or an intercepted SSL connection), Squid cannot detect
+#       the domain mismatch at certificate generation time when
+#       bump-server-first is used.
+#Default:
+# none
+
+#  TAG: sslproxy_cert_adapt
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#
+#       sslproxy_cert_adapt <adaptation algorithm> acl ...
+#
+#       The following certificate adaptation algorithms are supported:
+#
+#          setValidAfter
+#               Sets the "Not After" property to the "Not After" property of
+#               the CA certificate used to sign generated certificates.
+#
+#          setValidBefore
+#               Sets the "Not Before" property to the "Not Before" property of
+#               the CA certificate used to sign generated certificates.
+#
+#          setCommonName or setCommonName{CN}
+#               Sets Subject.CN property to the host name specified as a
+#               CN parameter or, if no explicit CN parameter was specified,
+#               extracted from the CONNECT request. It is a misconfiguration
+#               to use setCommonName without an explicit parameter for
+#               intercepted or tproxied SSL connections.
+#
+#       This clause only supports fast acl types.
+#
+#       Squid first groups sslproxy_cert_adapt options by adaptation algorithm.
+#       Within a group, when sslproxy_cert_adapt acl(s) match, Squid uses the
+#       corresponding adaptation algorithm to generate the certificate and
+#       ignores all subsequent sslproxy_cert_adapt options in that algorithm's
+#       group (i.e., the first match wins within each algorithm group). If no
+#       acl(s) match, the default mimicking action takes place.
+#
+#       WARNING: SQUID_X509_V_ERR_DOMAIN_MISMATCH and ssl:certDomainMismatch can
+#       be used with sslproxy_cert_adapt, but if and only if Squid is bumping a
+#       CONNECT request that carries a domain name. In all other cases (CONNECT
+#       to an IP address or an intercepted SSL connection), Squid cannot detect
+#       the domain mismatch at certificate generation time when
+#       bump-server-first is used.
+#Default:
+# none
+
+#  TAG: sslpassword_program
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Specify a program used for entering SSL key passphrases
+#       when using encrypted SSL certificate keys. If not specified
+#       keys must either be unencrypted, or Squid started with the -N
+#       option to allow it to query interactively for the passphrase.
+#
+#       The key file name is given as argument to the program allowing
+#       selection of the right password if you have multiple encrypted
+#       keys.
+#Default:
+# none
+
+# OPTIONS RELATING TO EXTERNAL SSL_CRTD
+# -----------------------------------------------------------------------------
+
+#  TAG: sslcrtd_program
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl-crtd
+#
+#       Specify the location and options of the executable for ssl_crtd process.
+#       /usr/lib/squid/ssl_crtd program requires -s and -M parameters
+#       For more information use:
+#               /usr/lib/squid/ssl_crtd -h
+#Default:
+# sslcrtd_program /usr/lib/squid/ssl_crtd -s /var/lib/ssl_db -M 4MB
+
+#  TAG: sslcrtd_children
+# Note: This option is only available if Squid is rebuilt with the
+#       --enable-ssl-crtd
+#
+#       The maximum number of processes spawn to service ssl server.
+#       The maximum this may be safely set to is 32.
+#
+#       The startup= and idle= options allow some measure of skew in your
+#       tuning.
+#
+#               startup=N
+#
+#       Sets the minimum number of processes to spawn when Squid
+#       starts or reconfigures. When set to zero the first request will
+#       cause spawning of the first child process to handle it.
+#
+#       Starting too few children temporary slows Squid under load while it
+#       tries to spawn enough additional processes to cope with traffic.
+#
+#               idle=N
+#
+#       Sets a minimum of how many processes Squid is to try and keep available
+#       at all times. When traffic begins to rise above what the existing
+#       processes can handle this many more will be spawned up to the maximum
+#       configured. A minimum setting of 1 is required.
+#
+#       You must have at least one ssl_crtd process.
+#Default:
+# sslcrtd_children 32 startup=5 idle=1
+
+#  TAG: sslcrtvalidator_program
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       Specify the location and options of the executable for ssl_crt_validator
+#       process.
+#
+#       Usage:  sslcrtvalidator_program [ttl=n] [cache=n] path ...
+#
+#       Options:
+#         ttl=n         TTL in seconds for cached results. The default is 60 secs
+#         cache=n       limit the result cache size. The default value is 2048
+#Default:
+# none
+
+#  TAG: sslcrtvalidator_children
+# Note: This option is only available if Squid is rebuilt with the
+#       --with-openssl
+#
+#       The maximum number of processes spawn to service SSL server.
+#       The maximum this may be safely set to is 32.
+#
+#       The startup= and idle= options allow some measure of skew in your
+#       tuning.
+#
+#               startup=N
+#
+#       Sets the minimum number of processes to spawn when Squid
+#       starts or reconfigures. When set to zero the first request will
+#       cause spawning of the first child process to handle it.
+#
+#       Starting too few children temporary slows Squid under load while it
+#       tries to spawn enough additional processes to cope with traffic.
+#
+#               idle=N
+#
+#       Sets a minimum of how many processes Squid is to try and keep available
+#       at all times. When traffic begins to rise above what the existing
+#       processes can handle this many more will be spawned up to the maximum
+#       configured. A minimum setting of 1 is required.
+#
+#               concurrency=
+#
+#       The number of requests each certificate validator helper can handle in
+#       parallel. A value of 0 indicates the certficate validator does not
+#       support concurrency. Defaults to 1.
+#
+#       When this directive is set to a value >= 1 then the protocol
+#       used to communicate with the helper is modified to include
+#       a request ID in front of the request/response. The request
+#       ID from the request must be echoed back with the response
+#       to that request.
+#
+#       You must have at least one ssl_crt_validator process.
+#Default:
+# sslcrtvalidator_children 32 startup=5 idle=1 concurrency=1
+
+# OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_peer
+#       To specify other caches in a hierarchy, use the format:
+#
+#               cache_peer hostname type http-port icp-port [options]
+#
+#       For example,
+#
+#       #                                        proxy  icp
+#       #          hostname             type     port   port  options
+#       #          -------------------- -------- ----- -----  -----------
+#       cache_peer parent.foo.net       parent    3128  3130  default
+#       cache_peer sib1.foo.net         sibling   3128  3130  proxy-only
+#       cache_peer sib2.foo.net         sibling   3128  3130  proxy-only
+#       cache_peer example.com          parent    80       0  default
+#       cache_peer cdn.example.com      sibling   3128     0
+#
+#             type:     either 'parent', 'sibling', or 'multicast'.
+#
+#       proxy-port:     The port number where the peer accept HTTP requests.
+#                       For other Squid proxies this is usually 3128
+#                       For web servers this is usually 80
+#
+#         icp-port:     Used for querying neighbor caches about objects.
+#                       Set to 0 if the peer does not support ICP or HTCP.
+#                       See ICP and HTCP options below for additional details.
+#
+#
+#       ==== ICP OPTIONS ====
+#
+#       You MUST also set icp_port and icp_access explicitly when using these options.
+#       The defaults will prevent peer traffic using ICP.
+#
+#
+#       no-query        Disable ICP queries to this neighbor.
+#
+#       multicast-responder
+#                       Indicates the named peer is a member of a multicast group.
+#                       ICP queries will not be sent directly to the peer, but ICP
+#                       replies will be accepted from it.
+#
+#       closest-only    Indicates that, for ICP_OP_MISS replies, we'll only forward
+#                       CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes.
+#
+#       background-ping
+#                       To only send ICP queries to this neighbor infrequently.
+#                       This is used to keep the neighbor round trip time updated
+#                       and is usually used in conjunction with weighted-round-robin.
+#
+#
+#       ==== HTCP OPTIONS ====
+#
+#       You MUST also set htcp_port and htcp_access explicitly when using these options.
+#       The defaults will prevent peer traffic using HTCP.
+#
+#
+#       htcp            Send HTCP, instead of ICP, queries to the neighbor.
+#                       You probably also want to set the "icp-port" to 4827
+#                       instead of 3130. This directive accepts a comma separated
+#                       list of options described below.
+#
+#       htcp=oldsquid   Send HTCP to old Squid versions (2.5 or earlier).
+#
+#       htcp=no-clr     Send HTCP to the neighbor but without
+#                       sending any CLR requests.  This cannot be used with
+#                       only-clr.
+#
+#       htcp=only-clr   Send HTCP to the neighbor but ONLY CLR requests.
+#                       This cannot be used with no-clr.
+#
+#       htcp=no-purge-clr
+#                       Send HTCP to the neighbor including CLRs but only when
+#                       they do not result from PURGE requests.
+#
+#       htcp=forward-clr
+#                       Forward any HTCP CLR requests this proxy receives to the peer.
+#
+#
+#       ==== PEER SELECTION METHODS ====
+#
+#       The default peer selection method is ICP, with the first responding peer
+#       being used as source. These options can be used for better load balancing.
+#
+#
+#       default         This is a parent cache which can be used as a "last-resort"
+#                       if a peer cannot be located by any of the peer-selection methods.
+#                       If specified more than once, only the first is used.
+#
+#       round-robin     Load-Balance parents which should be used in a round-robin
+#                       fashion in the absence of any ICP queries.
+#                       weight=N can be used to add bias.
+#
+#       weighted-round-robin
+#                       Load-Balance parents which should be used in a round-robin
+#                       fashion with the frequency of each parent being based on the
+#                       round trip time. Closer parents are used more often.
+#                       Usually used for background-ping parents.
+#                       weight=N can be used to add bias.
+#
+#       carp            Load-Balance parents which should be used as a CARP array.
+#                       The requests will be distributed among the parents based on the
+#                       CARP load balancing hash function based on their weight.
+#
+#       userhash        Load-balance parents based on the client proxy_auth or ident username.
+#
+#       sourcehash      Load-balance parents based on the client source IP.
+#
+#       multicast-siblings
+#                       To be used only for cache peers of type "multicast".
+#                       ALL members of this multicast group have "sibling"
+#                       relationship with it, not "parent".  This is to a multicast
+#                       group when the requested object would be fetched only from
+#                       a "parent" cache, anyway.  It's useful, e.g., when
+#                       configuring a pool of redundant Squid proxies, being
+#                       members of the same multicast group.
+#
+#
+#       ==== PEER SELECTION OPTIONS ====
+#
+#       weight=N        use to affect the selection of a peer during any weighted
+#                       peer-selection mechanisms.
+#                       The weight must be an integer; default is 1,
+#                       larger weights are favored more.
+#                       This option does not affect parent selection if a peering
+#                       protocol is not in use.
+#
+#       basetime=N      Specify a base amount to be subtracted from round trip
+#                       times of parents.
+#                       It is subtracted before division by weight in calculating
+#                       which parent to fectch from. If the rtt is less than the
+#                       base time the rtt is set to a minimal value.
+#
+#       ttl=N           Specify a TTL to use when sending multicast ICP queries
+#                       to this address.
+#                       Only useful when sending to a multicast group.
+#                       Because we don't accept ICP replies from random
+#                       hosts, you must configure other group members as
+#                       peers with the 'multicast-responder' option.
+#
+#       no-delay        To prevent access to this neighbor from influencing the
+#                       delay pools.
+#
+#       digest-url=URL  Tell Squid to fetch the cache digest (if digests are
+#                       enabled) for this host from the specified URL rather
+#                       than the Squid default location.
+#
+#
+#       ==== CARP OPTIONS ====
+#
+#       carp-key=key-specification
+#                       use a different key than the full URL to hash against the peer.
+#                       the key-specification is a comma-separated list of the keywords
+#                       scheme, host, port, path, params
+#                       Order is not important.
+#
+#       ==== ACCELERATOR / REVERSE-PROXY OPTIONS ====
+#
+#       originserver    Causes this parent to be contacted as an origin server.
+#                       Meant to be used in accelerator setups when the peer
+#                       is a web server.
+#
+#       forceddomain=name
+#                       Set the Host header of requests forwarded to this peer.
+#                       Useful in accelerator setups where the server (peer)
+#                       expects a certain domain name but clients may request
+#                       others. ie example.com or www.example.com
+#
+#       no-digest       Disable request of cache digests.
+#
+#       no-netdb-exchange
+#                       Disables requesting ICMP RTT database (NetDB).
+#
+#
+#       ==== AUTHENTICATION OPTIONS ====
+#
+#       login=user:password
+#                       If this is a personal/workgroup proxy and your parent
+#                       requires proxy authentication.
+#
+#                       Note: The string can include URL escapes (i.e. %20 for
+#                       spaces). This also means % must be written as %%.
+#
+#       login=PASSTHRU
+#                       Send login details received from client to this peer.
+#                       Both Proxy- and WWW-Authorization headers are passed
+#                       without alteration to the peer.
+#                       Authentication is not required by Squid for this to work.
+#
+#                       Note: This will pass any form of authentication but
+#                       only Basic auth will work through a proxy unless the
+#                       connection-auth options are also used.
+#
+#       login=PASS      Send login details received from client to this peer.
+#                       Authentication is not required by this option.
+#
+#                       If there are no client-provided authentication headers
+#                       to pass on, but username and password are available
+#                       from an external ACL user= and password= result tags
+#                       they may be sent instead.
+#
+#                       Note: To combine this with proxy_auth both proxies must
+#                       share the same user database as HTTP only allows for
+#                       a single login (one for proxy, one for origin server).
+#                       Also be warned this will expose your users proxy
+#                       password to the peer. USE WITH CAUTION
+#
+#       login=*:password
+#                       Send the username to the upstream cache, but with a
+#                       fixed password. This is meant to be used when the peer
+#                       is in another administrative domain, but it is still
+#                       needed to identify each user.
+#                       The star can optionally be followed by some extra
+#                       information which is added to the username. This can
+#                       be used to identify this proxy to the peer, similar to
+#                       the login=username:password option above.
+#
+#       login=NEGOTIATE
+#                       If this is a personal/workgroup proxy and your parent
+#                       requires a secure proxy authentication.
+#                       The first principal from the default keytab or defined by
+#                       the environment variable KRB5_KTNAME will be used.
+#
+#                       WARNING: The connection may transmit requests from multiple
+#                       clients. Negotiate often assumes end-to-end authentication
+#                       and a single-client. Which is not strictly true here.
+#
+#       login=NEGOTIATE:principal_name
+#                       If this is a personal/workgroup proxy and your parent
+#                       requires a secure proxy authentication.
+#                       The principal principal_name from the default keytab or
+#                       defined by the environment variable KRB5_KTNAME will be
+#                       used.
+#
+#                       WARNING: The connection may transmit requests from multiple
+#                       clients. Negotiate often assumes end-to-end authentication
+#                       and a single-client. Which is not strictly true here.
+#
+#       connection-auth=on|off
+#                       Tell Squid that this peer does or not support Microsoft
+#                       connection oriented authentication, and any such
+#                       challenges received from there should be ignored.
+#                       Default is auto to automatically determine the status
+#                       of the peer.
+#
+#
+#       ==== SSL / HTTPS / TLS OPTIONS ====
+#
+#       ssl             Encrypt connections to this peer with SSL/TLS.
+#
+#       sslcert=/path/to/ssl/certificate
+#                       A client SSL certificate to use when connecting to
+#                       this peer.
+#
+#       sslkey=/path/to/ssl/key
+#                       The private SSL key corresponding to sslcert above.
+#                       If 'sslkey' is not specified 'sslcert' is assumed to
+#                       reference a combined file containing both the
+#                       certificate and the key.
+#
+#       Notes:
+#
+#       On Debian/Ubuntu systems a default snakeoil certificate is
+#    available in /etc/ssl and users can set:
+#
+#               cert=/etc/ssl/certs/ssl-cert-snakeoil.pem
+#
+#       and
+#
+#               key=/etc/ssl/private/ssl-cert-snakeoil.key
+#
+#       for testing.
+#
+#       sslversion=1|2|3|4|5|6
+#                       The SSL version to use when connecting to this peer
+#                               1 = automatic (default)
+#                               2 = SSL v2 only
+#                               3 = SSL v3 only
+#                               4 = TLS v1.0 only
+#                               5 = TLS v1.1 only
+#                               6 = TLS v1.2 only
+#
+#       sslcipher=...   The list of valid SSL ciphers to use when connecting
+#                       to this peer.
+#
+#       ssloptions=...  Specify various SSL implementation options:
+#
+#                           NO_SSLv2    Disallow the use of SSLv2
+#                           NO_SSLv3    Disallow the use of SSLv3
+#                           NO_TLSv1    Disallow the use of TLSv1.0
+#                           NO_TLSv1_1  Disallow the use of TLSv1.1
+#                           NO_TLSv1_2  Disallow the use of TLSv1.2
+#
+#                           SINGLE_DH_USE
+#                                     Always create a new key when using
+#                                     temporary/ephemeral DH key exchanges
+#
+#                           NO_TICKET
+#                                     Disable use of RFC5077 session tickets. Some servers
+#                                     may have problems understanding the TLS extension due
+#                                     to ambiguous specification in RFC4507.
+#
+#                           ALL       Enable various bug workarounds
+#                                     suggested as "harmless" by OpenSSL
+#                                     Be warned that this reduces SSL/TLS
+#                                     strength to some attacks.
+#
+#                       See the OpenSSL SSL_CTX_set_options documentation for a
+#                       more complete list.
+#
+#       sslcafile=...   A file containing additional CA certificates to use
+#                       when verifying the peer certificate.
+#
+#       sslcapath=...   A directory containing additional CA certificates to
+#                       use when verifying the peer certificate.
+#
+#       sslcrlfile=...  A certificate revocation list file to use when
+#                       verifying the peer certificate.
+#
+#       sslflags=...    Specify various flags modifying the SSL implementation:
+#
+#                       DONT_VERIFY_PEER
+#                               Accept certificates even if they fail to
+#                               verify.
+#                       NO_DEFAULT_CA
+#                               Don't use the default CA list built in
+#                               to OpenSSL.
+#                       DONT_VERIFY_DOMAIN
+#                               Don't verify the peer certificate
+#                               matches the server name
+#
+#       ssldomain=      The peer name as advertised in it's certificate.
+#                       Used for verifying the correctness of the received peer
+#                       certificate. If not specified the peer hostname will be
+#                       used.
+#
+#       front-end-https
+#                       Enable the "Front-End-Https: On" header needed when
+#                       using Squid as a SSL frontend in front of Microsoft OWA.
+#                       See MS KB document Q307347 for details on this header.
+#                       If set to auto the header will only be added if the
+#                       request is forwarded as a https:// URL.
+#
+#
+#       ==== GENERAL OPTIONS ====
+#
+#       connect-timeout=N
+#                       A peer-specific connect timeout.
+#                       Also see the peer_connect_timeout directive.
+#
+#       connect-fail-limit=N
+#                       How many times connecting to a peer must fail before
+#                       it is marked as down. Standby connection failures
+#                       count towards this limit. Default is 10.
+#
+#       allow-miss      Disable Squid's use of only-if-cached when forwarding
+#                       requests to siblings. This is primarily useful when
+#                       icp_hit_stale is used by the sibling. Excessive use
+#                       of this option may result in forwarding loops. One way
+#                       to prevent peering loops when using this option, is to
+#                       deny cache peer usage on requests from a peer:
+#                       acl fromPeer ...
+#                       cache_peer_access peerName deny fromPeer
+#
+#       max-conn=N      Limit the number of concurrent connections the Squid
+#                       may open to this peer, including already opened idle
+#                       and standby connections. There is no peer-specific
+#                       connection limit by default.
+#
+#                       A peer exceeding the limit is not used for new
+#                       requests unless a standby connection is available.
+#
+#                       max-conn currently works poorly with idle persistent
+#                       connections: When a peer reaches its max-conn limit,
+#                       and there are idle persistent connections to the peer,
+#                       the peer may not be selected because the limiting code
+#                       does not know whether Squid can reuse those idle
+#                       connections.
+#
+#       standby=N       Maintain a pool of N "hot standby" connections to an
+#                       UP peer, available for requests when no idle
+#                       persistent connection is available (or safe) to use.
+#                       By default and with zero N, no such pool is maintained.
+#                       N must not exceed the max-conn limit (if any).
+#
+#                       At start or after reconfiguration, Squid opens new TCP
+#                       standby connections until there are N connections
+#                       available and then replenishes the standby pool as
+#                       opened connections are used up for requests. A used
+#                       connection never goes back to the standby pool, but
+#                       may go to the regular idle persistent connection pool
+#                       shared by all peers and origin servers.
+#
+#                       Squid never opens multiple new standby connections
+#                       concurrently.  This one-at-a-time approach minimizes
+#                       flooding-like effect on peers. Furthermore, just a few
+#                       standby connections should be sufficient in most cases
+#                       to supply most new requests with a ready-to-use
+#                       connection.
+#
+#                       Standby connections obey server_idle_pconn_timeout.
+#                       For the feature to work as intended, the peer must be
+#                       configured to accept and keep them open longer than
+#                       the idle timeout at the connecting Squid, to minimize
+#                       race conditions typical to idle used persistent
+#                       connections. Default request_timeout and
+#                       server_idle_pconn_timeout values ensure such a
+#                       configuration.
+#
+#       name=xxx        Unique name for the peer.
+#                       Required if you have multiple peers on the same host
+#                       but different ports.
+#                       This name can be used in cache_peer_access and similar
+#                       directives to identify the peer.
+#                       Can be used by outgoing access controls through the
+#                       peername ACL type.
+#
+#       no-tproxy       Do not use the client-spoof TPROXY support when forwarding
+#                       requests to this peer. Use normal address selection instead.
+#                       This overrides the spoof_client_ip ACL.
+#
+#       proxy-only      objects fetched from the peer will not be stored locally.
+#
+#Default:
+# none
+
+#  TAG: cache_peer_domain
+#       Use to limit the domains for which a neighbor cache will be
+#       queried.
+#
+#       Usage:
+#               cache_peer_domain cache-host domain [domain ...]
+#               cache_peer_domain cache-host !domain
+#
+#       For example, specifying
+#
+#               cache_peer_domain parent.foo.net        .edu
+#
+#       has the effect such that UDP query packets are sent to
+#       'bigserver' only when the requested object exists on a
+#       server in the .edu domain.  Prefixing the domainname
+#       with '!' means the cache will be queried for objects
+#       NOT in that domain.
+#
+#       NOTE:   * Any number of domains may be given for a cache-host,
+#                 either on the same or separate lines.
+#               * When multiple domains are given for a particular
+#                 cache-host, the first matched domain is applied.
+#               * Cache hosts with no domain restrictions are queried
+#                 for all requests.
+#               * There are no defaults.
+#               * There is also a 'cache_peer_access' tag in the ACL
+#                 section.
+#Default:
+# none
+
+#  TAG: cache_peer_access
+#       Restricts usage of cache_peer proxies.
+#
+#       Usage:
+#               cache_peer_access peer-name allow|deny [!]aclname ...
+#
+#       For the required peer-name parameter, use either the value of the
+#       cache_peer name=value parameter or, if name=value is missing, the
+#       cache_peer hostname parameter.
+#
+#       This directive narrows down the selection of peering candidates, but
+#       does not determine the order in which the selected candidates are
+#       contacted. That order is determined by the peer selection algorithms
+#       (see PEER SELECTION sections in the cache_peer documentation).
+#
+#       If a deny rule matches, the corresponding peer will not be contacted
+#       for the current transaction -- Squid will not send ICP queries and
+#       will not forward HTTP requests to that peer. An allow match leaves
+#       the corresponding peer in the selection. The first match for a given
+#       peer wins for that peer.
+#
+#       The relative order of cache_peer_access directives for the same peer
+#       matters. The relative order of any two cache_peer_access directives
+#       for different peers does not matter. To ease interpretation, it is a
+#       good idea to group cache_peer_access directives for the same peer
+#       together.
+#
+#       A single cache_peer_access directive may be evaluated multiple times
+#       for a given transaction because individual peer selection algorithms
+#       may check it independently from each other. These redundant checks
+#       may be optimized away in future Squid versions.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# No peer usage restrictions.
+
+#  TAG: neighbor_type_domain
+#       Modify the cache_peer neighbor type when passing requests
+#       about specific domains to the peer.
+#
+#       Usage:
+#                neighbor_type_domain neighbor parent|sibling domain domain ...
+#
+#       For example:
+#               cache_peer foo.example.com parent 3128 3130
+#               neighbor_type_domain foo.example.com sibling .au .de
+#
+#       The above configuration treats all requests to foo.example.com as a
+#       parent proxy unless the request is for a .au or .de ccTLD domain name.
+#Default:
+# The peer type from cache_peer directive is used for all requests to that peer.
+
+#  TAG: dead_peer_timeout       (seconds)
+#       This controls how long Squid waits to declare a peer cache
+#       as "dead."  If there are no ICP replies received in this
+#       amount of time, Squid will declare the peer dead and not
+#       expect to receive any further ICP replies.  However, it
+#       continues to send ICP queries, and will mark the peer as
+#       alive upon receipt of the first subsequent ICP reply.
+#
+#       This timeout also affects when Squid expects to receive ICP
+#       replies from peers.  If more than 'dead_peer' seconds have
+#       passed since the last ICP reply was received, Squid will not
+#       expect to receive an ICP reply on the next query.  Thus, if
+#       your time between requests is greater than this timeout, you
+#       will see a lot of requests sent DIRECT to origin servers
+#       instead of to your parents.
+#Default:
+# dead_peer_timeout 10 seconds
+
+#  TAG: forward_max_tries
+#       Controls how many different forward paths Squid will try
+#       before giving up. See also forward_timeout.
+#
+#       NOTE: connect_retries (default: none) can make each of these
+#       possible forwarding paths be tried multiple times.
+#Default:
+# forward_max_tries 25
+
+# MEMORY CACHE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_mem       (bytes)
+#       NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE.
+#       IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL
+#       USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER
+#       THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS.
+#
+#       'cache_mem' specifies the ideal amount of memory to be used
+#       for:
+#               * In-Transit objects
+#               * Hot Objects
+#               * Negative-Cached objects
+#
+#       Data for these objects are stored in 4 KB blocks.  This
+#       parameter specifies the ideal upper limit on the total size of
+#       4 KB blocks allocated.  In-Transit objects take the highest
+#       priority.
+#
+#       In-transit objects have priority over the others.  When
+#       additional space is needed for incoming data, negative-cached
+#       and hot objects will be released.  In other words, the
+#       negative-cached and hot objects will fill up any unused space
+#       not needed for in-transit objects.
+#
+#       If circumstances require, this limit will be exceeded.
+#       Specifically, if your incoming request rate requires more than
+#       'cache_mem' of memory to hold in-transit objects, Squid will
+#       exceed this limit to satisfy the new requests.  When the load
+#       decreases, blocks will be freed until the high-water mark is
+#       reached.  Thereafter, blocks will be used to store hot
+#       objects.
+#
+#       If shared memory caching is enabled, Squid does not use the shared
+#       cache space for in-transit objects, but they still consume as much
+#       local memory as they need. For more details about the shared memory
+#       cache, see memory_cache_shared.
+#Default:
+# cache_mem 256 MB
+
+#  TAG: maximum_object_size_in_memory   (bytes)
+#       Objects greater than this size will not be attempted to kept in
+#       the memory cache. This should be set high enough to keep objects
+#       accessed frequently in memory to improve performance whilst low
+#       enough to keep larger objects from hoarding cache_mem.
+#Default:
+# maximum_object_size_in_memory 512 KB
+
+#  TAG: memory_cache_shared     on|off
+#       Controls whether the memory cache is shared among SMP workers.
+#
+#       The shared memory cache is meant to occupy cache_mem bytes and replace
+#       the non-shared memory cache, although some entities may still be
+#       cached locally by workers for now (e.g., internal and in-transit
+#       objects may be served from a local memory cache even if shared memory
+#       caching is enabled).
+#
+#       By default, the memory cache is shared if and only if all of the
+#       following conditions are satisfied: Squid runs in SMP mode with
+#       multiple workers, cache_mem is positive, and Squid environment
+#       supports required IPC primitives (e.g., POSIX shared memory segments
+#       and GCC-style atomic operations).
+#
+#       To avoid blocking locks, shared memory uses opportunistic algorithms
+#       that do not guarantee that every cachable entity that could have been
+#       shared among SMP workers will actually be shared.
+#Default:
+# "on" where supported if doing memory caching with multiple SMP workers.
+
+#  TAG: memory_cache_mode
+#       Controls which objects to keep in the memory cache (cache_mem)
+#
+#       always  Keep most recently fetched objects in memory (default)
+#
+#       disk    Only disk cache hits are kept in memory, which means
+#               an object must first be cached on disk and then hit
+#               a second time before cached in memory.
+#
+#       network Only objects fetched from network is kept in memory
+#Default:
+# Keep the most recently fetched objects in memory
+
+#  TAG: memory_replacement_policy
+#       The memory replacement policy parameter determines which
+#       objects are purged from memory when memory space is needed.
+#
+#       See cache_replacement_policy for details on algorithms.
+#Default:
+# memory_replacement_policy lru
+
+# DISK CACHE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_replacement_policy
+#       The cache replacement policy parameter determines which
+#       objects are evicted (replaced) when disk space is needed.
+#
+#           lru       : Squid's original list based LRU policy
+#           heap GDSF : Greedy-Dual Size Frequency
+#           heap LFUDA: Least Frequently Used with Dynamic Aging
+#           heap LRU  : LRU policy implemented using a heap
+#
+#       Applies to any cache_dir lines listed below this directive.
+#
+#       The LRU policies keeps recently referenced objects.
+#
+#       The heap GDSF policy optimizes object hit rate by keeping smaller
+#       popular objects in cache so it has a better chance of getting a
+#       hit.  It achieves a lower byte hit rate than LFUDA though since
+#       it evicts larger (possibly popular) objects.
+#
+#       The heap LFUDA policy keeps popular objects in cache regardless of
+#       their size and thus optimizes byte hit rate at the expense of
+#       hit rate since one large, popular object will prevent many
+#       smaller, slightly less popular objects from being cached.
+#
+#       Both policies utilize a dynamic aging mechanism that prevents
+#       cache pollution that can otherwise occur with frequency-based
+#       replacement policies.
+#
+#       NOTE: if using the LFUDA replacement policy you should increase
+#       the value of maximum_object_size above its default of 4 MB to
+#       to maximize the potential byte hit rate improvement of LFUDA.
+#
+#       For more information about the GDSF and LFUDA cache replacement
+#       policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html
+#       and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html.
+#Default:
+# cache_replacement_policy lru
+
+#  TAG: minimum_object_size     (bytes)
+#       Objects smaller than this size will NOT be saved on disk.  The
+#       value is specified in bytes, and the default is 0 KB, which
+#       means all responses can be stored.
+#Default:
+# no limit
+
+#  TAG: maximum_object_size     (bytes)
+#       Set the default value for max-size parameter on any cache_dir.
+#       The value is specified in bytes, and the default is 4 MB.
+#
+#       If you wish to get a high BYTES hit ratio, you should probably
+#       increase this (one 32 MB object hit counts for 3200 10KB
+#       hits).
+#
+#       If you wish to increase hit ratio more than you want to
+#       save bandwidth you should leave this low.
+#
+#       NOTE: if using the LFUDA replacement policy you should increase
+#       this value to maximize the byte hit rate improvement of LFUDA!
+#       See cache_replacement_policy for a discussion of this policy.
+#Default:
+# maximum_object_size 4 MB
+
+#  TAG: cache_dir
+#       Format:
+#               cache_dir Type Directory-Name Fs-specific-data [options]
+#
+#       You can specify multiple cache_dir lines to spread the
+#       cache among different disk partitions.
+#
+#       Type specifies the kind of storage system to use. Only "ufs"
+#       is built by default. To enable any of the other storage systems
+#       see the --enable-storeio configure option.
+#
+#       'Directory' is a top-level directory where cache swap
+#       files will be stored.  If you want to use an entire disk
+#       for caching, this can be the mount-point directory.
+#       The directory must exist and be writable by the Squid
+#       process.  Squid will NOT create this directory for you.
+#
+#       In SMP configurations, cache_dir must not precede the workers option
+#       and should use configuration macros or conditionals to give each
+#       worker interested in disk caching a dedicated cache directory.
+#
+#
+#       ====  The ufs store type  ====
+#
+#       "ufs" is the old well-known Squid storage format that has always
+#       been there.
+#
+#       Usage:
+#               cache_dir ufs Directory-Name Mbytes L1 L2 [options]
+#
+#       'Mbytes' is the amount of disk space (MB) to use under this
+#       directory.  The default is 100 MB.  Change this to suit your
+#       configuration.  Do NOT put the size of your disk drive here.
+#       Instead, if you want Squid to use the entire disk drive,
+#       subtract 20% and use that value.
+#
+#       'L1' is the number of first-level subdirectories which
+#       will be created under the 'Directory'.  The default is 16.
+#
+#       'L2' is the number of second-level subdirectories which
+#       will be created under each first-level directory.  The default
+#       is 256.
+#
+#
+#       ====  The aufs store type  ====
+#
+#       "aufs" uses the same storage format as "ufs", utilizing
+#       POSIX-threads to avoid blocking the main Squid process on
+#       disk-I/O. This was formerly known in Squid as async-io.
+#
+#       Usage:
+#               cache_dir aufs Directory-Name Mbytes L1 L2 [options]
+#
+#       see argument descriptions under ufs above
+#
+#
+#       ====  The diskd store type  ====
+#
+#       "diskd" uses the same storage format as "ufs", utilizing a
+#       separate process to avoid blocking the main Squid process on
+#       disk-I/O.
+#
+#       Usage:
+#               cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n]
+#
+#       see argument descriptions under ufs above
+#
+#       Q1 specifies the number of unacknowledged I/O requests when Squid
+#       stops opening new files. If this many messages are in the queues,
+#       Squid won't open new files. Default is 64
+#
+#       Q2 specifies the number of unacknowledged messages when Squid
+#       starts blocking.  If this many messages are in the queues,
+#       Squid blocks until it receives some replies. Default is 72
+#
+#       When Q1 < Q2 (the default), the cache directory is optimized
+#       for lower response time at the expense of a decrease in hit
+#       ratio.  If Q1 > Q2, the cache directory is optimized for
+#       higher hit ratio at the expense of an increase in response
+#       time.
+#
+#
+#       ====  The rock store type  ====
+#
+#       Usage:
+#           cache_dir rock Directory-Name Mbytes [options]
+#
+#       The Rock Store type is a database-style storage. All cached
+#       entries are stored in a "database" file, using fixed-size slots.
+#       A single entry occupies one or more slots.
+#
+#       If possible, Squid using Rock Store creates a dedicated kid
+#       process called "disker" to avoid blocking Squid worker(s) on disk
+#       I/O. One disker kid is created for each rock cache_dir.  Diskers
+#       are created only when Squid, running in daemon mode, has support
+#       for the IpcIo disk I/O module.
+#
+#       swap-timeout=msec: Squid will not start writing a miss to or
+#       reading a hit from disk if it estimates that the swap operation
+#       will take more than the specified number of milliseconds. By
+#       default and when set to zero, disables the disk I/O time limit
+#       enforcement. Ignored when using blocking I/O module because
+#       blocking synchronous I/O does not allow Squid to estimate the
+#       expected swap wait time.
+#
+#       max-swap-rate=swaps/sec: Artificially limits disk access using
+#       the specified I/O rate limit. Swap out requests that
+#       would cause the average I/O rate to exceed the limit are
+#       delayed. Individual swap in requests (i.e., hits or reads) are
+#       not delayed, but they do contribute to measured swap rate and
+#       since they are placed in the same FIFO queue as swap out
+#       requests, they may wait longer if max-swap-rate is smaller.
+#       This is necessary on file systems that buffer "too
+#       many" writes and then start blocking Squid and other processes
+#       while committing those writes to disk.  Usually used together
+#       with swap-timeout to avoid excessive delays and queue overflows
+#       when disk demand exceeds available disk "bandwidth". By default
+#       and when set to zero, disables the disk I/O rate limit
+#       enforcement. Currently supported by IpcIo module only.
+#
+#       slot-size=bytes: The size of a database "record" used for
+#       storing cached responses. A cached response occupies at least
+#       one slot and all database I/O is done using individual slots so
+#       increasing this parameter leads to more disk space waste while
+#       decreasing it leads to more disk I/O overheads. Should be a
+#       multiple of your operating system I/O page size. Defaults to
+#       16KBytes. A housekeeping header is stored with each slot and
+#       smaller slot-sizes will be rejected. The header is smaller than
+#       100 bytes.
+#
+#
+#       ==== COMMON OPTIONS ====
+#
+#       no-store        no new objects should be stored to this cache_dir.
+#
+#       min-size=n      the minimum object size in bytes this cache_dir
+#                       will accept.  It's used to restrict a cache_dir
+#                       to only store large objects (e.g. AUFS) while
+#                       other stores are optimized for smaller objects
+#                       (e.g. Rock).
+#                       Defaults to 0.
+#
+#       max-size=n      the maximum object size in bytes this cache_dir
+#                       supports.
+#                       The value in maximum_object_size directive sets
+#                       the default unless more specific details are
+#                       available (ie a small store capacity).
+#
+#       Note: To make optimal use of the max-size limits you should order
+#       the cache_dir lines with the smallest max-size value first.
+#
+#Default:
+# No disk cache. Store cache ojects only in memory.
+#
+
+# Uncomment and adjust the following to add a disk cache directory.
+#cache_dir ufs /var/spool/squid 100 16 256
+
+#  TAG: store_dir_select_algorithm
+#       How Squid selects which cache_dir to use when the response
+#       object will fit into more than one.
+#
+#       Regardless of which algorithm is used the cache_dir min-size
+#       and max-size parameters are obeyed. As such they can affect
+#       the selection algorithm by limiting the set of considered
+#       cache_dir.
+#
+#       Algorithms:
+#
+#               least-load
+#
+#       This algorithm is suited to caches with similar cache_dir
+#       sizes and disk speeds.
+#
+#       The disk with the least I/O pending is selected.
+#       When there are multiple disks with the same I/O load ranking
+#       the cache_dir with most available capacity is selected.
+#
+#       When a mix of cache_dir sizes are configured the faster disks
+#       have a naturally lower I/O loading and larger disks have more
+#       capacity. So space used to store objects and data throughput
+#       may be very unbalanced towards larger disks.
+#
+#
+#               round-robin
+#
+#       This algorithm is suited to caches with unequal cache_dir
+#       disk sizes.
+#
+#       Each cache_dir is selected in a rotation. The next suitable
+#       cache_dir is used.
+#
+#       Available cache_dir capacity is only considered in relation
+#       to whether the object will fit and meets the min-size and
+#       max-size parameters.
+#
+#       Disk I/O loading is only considered to prevent overload on slow
+#       disks. This algorithm does not spread objects by size, so any
+#       I/O loading per-disk may appear very unbalanced and volatile.
+#
+#       If several cache_dirs use similar min-size, max-size, or other
+#       limits to to reject certain responses, then do not group such
+#       cache_dir lines together, to avoid round-robin selection bias
+#       towards the first cache_dir after the group. Instead, interleave
+#       cache_dir lines from different groups. For example:
+#
+#               store_dir_select_algorithm round-robin
+#               cache_dir rock /hdd1 ... min-size=100000
+#               cache_dir rock /ssd1 ... max-size=99999
+#               cache_dir rock /hdd2 ... min-size=100000
+#               cache_dir rock /ssd2 ... max-size=99999
+#               cache_dir rock /hdd3 ... min-size=100000
+#               cache_dir rock /ssd3 ... max-size=99999
+#Default:
+# store_dir_select_algorithm least-load
+
+#  TAG: max_open_disk_fds
+#       To avoid having disk as the I/O bottleneck Squid can optionally
+#       bypass the on-disk cache if more than this amount of disk file
+#       descriptors are open.
+#
+#       A value of 0 indicates no limit.
+#Default:
+# no limit
+
+#  TAG: cache_swap_low  (percent, 0-100)
+#       The low-water mark for AUFS/UFS/diskd cache object eviction by
+#       the cache_replacement_policy algorithm.
+#
+#       Removal begins when the swap (disk) usage of a cache_dir is
+#       above this low-water mark and attempts to maintain utilization
+#       near the low-water mark.
+#
+#       As swap utilization increases towards the high-water mark set
+#       by cache_swap_high object eviction becomes more agressive.
+#
+#       The value difference in percentages between low- and high-water
+#       marks represent an eviction rate of 300 objects per second and
+#       the rate continues to scale in agressiveness by multiples of
+#       this above the high-water mark.
+#
+#       Defaults are 90% and 95%. If you have a large cache, 5% could be
+#       hundreds of MB. If this is the case you may wish to set these
+#       numbers closer together.
+#
+#       See also cache_swap_high and cache_replacement_policy
+#Default:
+# cache_swap_low 90
+
+#  TAG: cache_swap_high (percent, 0-100)
+#       The high-water mark for AUFS/UFS/diskd cache object eviction by
+#       the cache_replacement_policy algorithm.
+#
+#       Removal begins when the swap (disk) usage of a cache_dir is
+#       above the low-water mark set by cache_swap_low and attempts to
+#       maintain utilization near the low-water mark.
+#
+#       As swap utilization increases towards this high-water mark object
+#       eviction becomes more agressive.
+#
+#       The value difference in percentages between low- and high-water
+#       marks represent an eviction rate of 300 objects per second and
+#       the rate continues to scale in agressiveness by multiples of
+#       this above the high-water mark.
+#
+#       Defaults are 90% and 95%. If you have a large cache, 5% could be
+#       hundreds of MB. If this is the case you may wish to set these
+#       numbers closer together.
+#
+#       See also cache_swap_low and cache_replacement_policy
+#Default:
+# cache_swap_high 95
+
+# LOGFILE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: logformat
+#       Usage:
+#
+#       logformat <name> <format specification>
+#
+#       Defines an access log format.
+#
+#       The <format specification> is a string with embedded % format codes
+#
+#       % format codes all follow the same basic structure where all but
+#       the formatcode is optional. Output strings are automatically escaped
+#       as required according to their context and the output format
+#       modifiers are usually not needed, but can be specified if an explicit
+#       output format is desired.
+#
+#               % ["|[|'|#] [-] [[0]width] [{argument}] formatcode
+#
+#               "       output in quoted string format
+#               [       output in squid text log format as used by log_mime_hdrs
+#               #       output in URL quoted format
+#               '       output as-is
+#
+#               -       left aligned
+#
+#               width   minimum and/or maximum field width:
+#                           [width_min][.width_max]
+#                       When minimum starts with 0, the field is zero-padded.
+#                       String values exceeding maximum width are truncated.
+#
+#               {arg}   argument such as header name etc
+#
+#       Format codes:
+#
+#               %       a literal % character
+#               sn      Unique sequence number per log line entry
+#               err_code    The ID of an error response served by Squid or
+#                               a similar internal error identifier.
+#               err_detail  Additional err_code-dependent error information.
+#               note    The annotation specified by the argument. Also
+#                       logs the adaptation meta headers set by the
+#                       adaptation_meta configuration parameter.
+#                       If no argument given all annotations logged.
+#                       The argument may include a separator to use with
+#                       annotation values:
+#                            name[:separator]
+#                       By default, multiple note values are separated with ","
+#                       and multiple notes are separated with "\r\n".
+#                       When logging named notes with %{name}note, the
+#                       explicitly configured separator is used between note
+#                       values. When logging all notes with %note, the
+#                       explicitly configured separator is used between
+#                       individual notes. There is currently no way to
+#                       specify both value and notes separators when logging
+#                       all notes with %note.
+#
+#       Connection related format codes:
+#
+#               >a      Client source IP address
+#               >A      Client FQDN
+#               >p      Client source port
+#               >eui    Client source EUI (MAC address, EUI-48 or EUI-64 identifier)
+#               >la     Local IP address the client connected to
+#               >lp     Local port number the client connected to
+#               >qos    Client connection TOS/DSCP value set by Squid
+#               >nfmark Client connection netfilter mark set by Squid
+#
+#               la      Local listening IP address the client connection was connected to.
+#               lp      Local listening port number the client connection was connected to.
+#
+#               <a      Server IP address of the last server or peer connection
+#               <A      Server FQDN or peer name
+#               <p      Server port number of the last server or peer connection
+#               <la     Local IP address of the last server or peer connection
+#               <lp     Local port number of the last server or peer connection
+#               <qos    Server connection TOS/DSCP value set by Squid
+#               <nfmark Server connection netfilter mark set by Squid
+#
+#       Time related format codes:
+#
+#               ts      Seconds since epoch
+#               tu      subsecond time (milliseconds)
+#               tl      Local time. Optional strftime format argument
+#                               default %d/%b/%Y:%H:%M:%S %z
+#               tg      GMT time. Optional strftime format argument
+#                               default %d/%b/%Y:%H:%M:%S %z
+#               tr      Response time (milliseconds)
+#               dt      Total time spent making DNS lookups (milliseconds)
+#               tS      Approximate master transaction start time in
+#                       <full seconds since epoch>.<fractional seconds> format.
+#                       Currently, Squid considers the master transaction
+#                       started when a complete HTTP request header initiating
+#                       the transaction is received from the client. This is
+#                       the same value that Squid uses to calculate transaction
+#                       response time when logging %tr to access.log. Currently,
+#                       Squid uses millisecond resolution for %tS values,
+#                       similar to the default access.log "current time" field
+#                       (%ts.%03tu).
+#
+#       Access Control related format codes:
+#
+#               et      Tag returned by external acl
+#               ea      Log string returned by external acl
+#               un      User name (any available)
+#               ul      User name from authentication
+#               ue      User name from external acl helper
+#               ui      User name from ident
+#               un      A user name. Expands to the first available name
+#                       from the following list of information sources:
+#                       - authenticated user name, like %ul
+#                       - user name supplied by an external ACL, like %ue
+#                       - SSL client name, like %us
+#                       - ident user name, like %ui
+#               credentials Client credentials. The exact meaning depends on
+#                       the authentication scheme: For Basic authentication,
+#                       it is the password; for Digest, the realm sent by the
+#                       client; for NTLM and Negotiate, the client challenge
+#                       or client credentials prefixed with "YR " or "KK ".
+#
+#       HTTP related format codes:
+#
+#           REQUEST
+#
+#               [http::]rm      Request method (GET/POST etc)
+#               [http::]>rm     Request method from client
+#               [http::]<rm     Request method sent to server or peer
+#               [http::]ru      Request URL from client (historic, filtered for logging)
+#               [http::]>ru     Request URL from client
+#               [http::]<ru     Request URL sent to server or peer
+#               [http::]>rs     Request URL scheme from client
+#               [http::]<rs     Request URL scheme sent to server or peer
+#               [http::]>rd     Request URL domain from client
+#               [http::]<rd     Request URL domain sent to server or peer
+#               [http::]>rP     Request URL port from client
+#               [http::]<rP     Request URL port sent to server or peer
+#               [http::]rp      Request URL path excluding hostname
+#               [http::]>rp     Request URL path excluding hostname from client
+#               [http::]<rp     Request URL path excluding hostname sent to server or peer
+#               [http::]rv      Request protocol version
+#               [http::]>rv     Request protocol version from client
+#               [http::]<rv     Request protocol version sent to server or peer
+#
+#               [http::]>h      Original received request header.
+#                               Usually differs from the request header sent by
+#                               Squid, although most fields are often preserved.
+#                               Accepts optional header field name/value filter
+#                               argument using name[:[separator]element] format.
+#               [http::]>ha     Received request header after adaptation and
+#                               redirection (pre-cache REQMOD vectoring point).
+#                               Usually differs from the request header sent by
+#                               Squid, although most fields are often preserved.
+#                               Optional header name argument as for >h
+#
+#
+#           RESPONSE
+#
+#               [http::]<Hs     HTTP status code received from the next hop
+#               [http::]>Hs     HTTP status code sent to the client
+#
+#               [http::]<h      Reply header. Optional header name argument
+#                               as for >h
+#
+#               [http::]mt      MIME content type
+#
+#
+#           SIZE COUNTERS
+#
+#               [http::]st      Total size of request + reply traffic with client
+#               [http::]>st     Total size of request received from client.
+#                               Excluding chunked encoding bytes.
+#               [http::]<st     Total size of reply sent to client (after adaptation)
+#
+#               [http::]>sh     Size of request headers received from client
+#               [http::]<sh     Size of reply headers sent to client (after adaptation)
+#
+#               [http::]<sH     Reply high offset sent
+#               [http::]<sS     Upstream object size
+#
+#               [http::]<bs     Number of HTTP-equivalent message body bytes
+#                               received from the next hop, excluding chunked
+#                               transfer encoding and control messages.
+#                               Generated FTP/Gopher listings are treated as
+#                               received bodies.
+#
+#
+#           TIMING
+#
+#               [http::]<pt     Peer response time in milliseconds. The timer starts
+#                               when the last request byte is sent to the next hop
+#                               and stops when the last response byte is received.
+#               [http::]<tt     Total time in milliseconds. The timer
+#                               starts with the first connect request (or write I/O)
+#                               sent to the first selected peer. The timer stops
+#                               with the last I/O with the last peer.
+#
+#       Squid handling related format codes:
+#
+#               Ss      Squid request status (TCP_MISS etc)
+#               Sh      Squid hierarchy status (DEFAULT_PARENT etc)
+#
+#       SSL-related format codes:
+#
+#               ssl::bump_mode  SslBump decision for the transaction:
+#
+#                               For CONNECT requests that initiated bumping of
+#                               a connection and for any request received on
+#                               an already bumped connection, Squid logs the
+#                               corresponding SslBump mode ("server-first" or
+#                               "client-first"). See the ssl_bump option for
+#                               more information about these modes.
+#
+#                               A "none" token is logged for requests that
+#                               triggered "ssl_bump" ACL evaluation matching
+#                               either a "none" rule or no rules at all.
+#
+#                               In all other cases, a single dash ("-") is
+#                               logged.
+#
+#               ssl::>sni       SSL client SNI sent to Squid. Available only
+#                               after the peek, stare, or splice SSL bumping
+#                               actions.
+#
+#       If ICAP is enabled, the following code becomes available (as
+#       well as ICAP log codes documented with the icap_log option):
+#
+#               icap::tt        Total ICAP processing time for the HTTP
+#                               transaction. The timer ticks when ICAP
+#                               ACLs are checked and when ICAP
+#                               transaction is in progress.
+#
+#       If adaptation is enabled the following three codes become available:
+#
+#               adapt::<last_h  The header of the last ICAP response or
+#                               meta-information from the last eCAP
+#                               transaction related to the HTTP transaction.
+#                               Like <h, accepts an optional header name
+#                               argument.
+#
+#               adapt::sum_trs Summed adaptation transaction response
+#                               times recorded as a comma-separated list in
+#                               the order of transaction start time. Each time
+#                               value is recorded as an integer number,
+#                               representing response time of one or more
+#                               adaptation (ICAP or eCAP) transaction in
+#                               milliseconds.  When a failed transaction is
+#                               being retried or repeated, its time is not
+#                               logged individually but added to the
+#                               replacement (next) transaction. See also:
+#                               adapt::all_trs.
+#
+#               adapt::all_trs All adaptation transaction response times.
+#                               Same as adaptation_strs but response times of
+#                               individual transactions are never added
+#                               together. Instead, all transaction response
+#                               times are recorded individually.
+#
+#       You can prefix adapt::*_trs format codes with adaptation
+#       service name in curly braces to record response time(s) specific
+#       to that service. For example: %{my_service}adapt::sum_trs
+#
+#       If SSL is enabled, the following formating codes become available:
+#
+#               %ssl::>cert_subject The Subject field of the received client
+#                               SSL certificate or a dash ('-') if Squid has
+#                               received an invalid/malformed certificate or
+#                               no certificate at all. Consider encoding the
+#                               logged value because Subject often has spaces.
+#
+#               %ssl::>cert_issuer The Issuer field of the received client
+#                               SSL certificate or a dash ('-') if Squid has
+#                               received an invalid/malformed certificate or
+#                               no certificate at all. Consider encoding the
+#                               logged value because Issuer often has spaces.
+#
+#       The default formats available (which do not need re-defining) are:
+#
+#logformat squid      %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
+#logformat common     %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh
+#logformat combined   %>a %[ui %[un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
+#logformat referrer   %ts.%03tu %>a %{Referer}>h %ru
+#logformat useragent  %>a [%tl] "%{User-Agent}>h"
+#
+#       NOTE: When the log_mime_hdrs directive is set to ON.
+#               The squid, common and combined formats have a safely encoded copy
+#               of the mime headers appended to each line within a pair of brackets.
+#
+#       NOTE: The common and combined formats are not quite true to the Apache definition.
+#               The logs from Squid contain an extra status and hierarchy code appended.
+#
+#Default:
+# The format definitions squid, common, combined, referrer, useragent are built in.
+
+#  TAG: access_log
+#       Configures whether and how Squid logs HTTP and ICP transactions.
+#       If access logging is enabled, a single line is logged for every
+#       matching HTTP or ICP request. The recommended directive formats are:
+#
+#       access_log <module>:<place> [option ...] [acl acl ...]
+#       access_log none [acl acl ...]
+#
+#       The following directive format is accepted but may be deprecated:
+#       access_log <module>:<place> [<logformat name> [acl acl ...]]
+#
+#        In most cases, the first ACL name must not contain the '=' character
+#       and should not be equal to an existing logformat name. You can always
+#       start with an 'all' ACL to work around those restrictions.
+#
+#       Will log to the specified module:place using the specified format (which
+#       must be defined in a logformat directive) those entries which match
+#       ALL the acl's specified (which must be defined in acl clauses).
+#       If no acl is specified, all requests will be logged to this destination.
+#
+#       ===== Available options for the recommended directive format =====
+#
+#       logformat=name          Names log line format (either built-in or
+#                               defined by a logformat directive). Defaults
+#                               to 'squid'.
+#
+#       buffer-size=64KB        Defines approximate buffering limit for log
+#                               records (see buffered_logs).  Squid should not
+#                               keep more than the specified size and, hence,
+#                               should flush records before the buffer becomes
+#                               full to avoid overflows under normal
+#                               conditions (the exact flushing algorithm is
+#                               module-dependent though).  The on-error option
+#                               controls overflow handling.
+#
+#       on-error=die|drop       Defines action on unrecoverable errors. The
+#                               'drop' action ignores (i.e., does not log)
+#                               affected log records. The default 'die' action
+#                               kills the affected worker. The drop action
+#                               support has not been tested for modules other
+#                               than tcp.
+#
+#       ===== Modules Currently available =====
+#
+#       none    Do not log any requests matching these ACL.
+#               Do not specify Place or logformat name.
+#
+#       stdio   Write each log line to disk immediately at the completion of
+#               each request.
+#               Place: the filename and path to be written.
+#
+#       daemon  Very similar to stdio. But instead of writing to disk the log
+#               line is passed to a daemon helper for asychronous handling instead.
+#               Place: varies depending on the daemon.
+#
+#               log_file_daemon Place: the file name and path to be written.
+#
+#       syslog  To log each request via syslog facility.
+#               Place: The syslog facility and priority level for these entries.
+#               Place Format:  facility.priority
+#
+#               where facility could be any of:
+#                       authpriv, daemon, local0 ... local7 or user.
+#
+#               And priority could be any of:
+#                       err, warning, notice, info, debug.
+#
+#       udp     To send each log line as text data to a UDP receiver.
+#               Place: The destination host name or IP and port.
+#               Place Format:   //host:port
+#
+#       tcp     To send each log line as text data to a TCP receiver.
+#               Lines may be accumulated before sending (see buffered_logs).
+#               Place: The destination host name or IP and port.
+#               Place Format:   //host:port
+#
+#       Default:
+#               access_log daemon:/var/log/squid/access.log squid
+#Default:
+# access_log daemon:/var/log/squid/access.log squid
+
+#  TAG: icap_log
+#       ICAP log files record ICAP transaction summaries, one line per
+#       transaction.
+#
+#       The icap_log option format is:
+#       icap_log <filepath> [<logformat name> [acl acl ...]]
+#       icap_log none [acl acl ...]]
+#
+#       Please see access_log option documentation for details. The two
+#       kinds of logs share the overall configuration approach and many
+#       features.
+#
+#       ICAP processing of a single HTTP message or transaction may
+#       require multiple ICAP transactions.  In such cases, multiple
+#       ICAP transaction log lines will correspond to a single access
+#       log line.
+#
+#       ICAP log supports many access.log logformat %codes. In ICAP context,
+#       HTTP message-related %codes are applied to the HTTP message embedded
+#       in an ICAP message. Logformat "%http::>..." codes are used for HTTP
+#       messages embedded in ICAP requests while "%http::<..." codes are used
+#       for HTTP messages embedded in ICAP responses. For example:
+#
+#               http::>h        To-be-adapted HTTP message headers sent by Squid to
+#                               the ICAP service. For REQMOD transactions, these are
+#                               HTTP request headers. For RESPMOD, these are HTTP
+#                               response headers, but Squid currently cannot log them
+#                               (i.e., %http::>h will expand to "-" for RESPMOD).
+#
+#               http::<h        Adapted HTTP message headers sent by the ICAP
+#                               service to Squid (i.e., HTTP request headers in regular
+#                               REQMOD; HTTP response headers in RESPMOD and during
+#                               request satisfaction in REQMOD).
+#
+#       ICAP OPTIONS transactions do not embed HTTP messages.
+#
+#       Several logformat codes below deal with ICAP message bodies. An ICAP
+#       message body, if any, typically includes a complete HTTP message
+#       (required HTTP headers plus optional HTTP message body). When
+#       computing HTTP message body size for these logformat codes, Squid
+#       either includes or excludes chunked encoding overheads; see
+#       code-specific documentation for details.
+#
+#       For Secure ICAP services, all size-related information is currently
+#       computed before/after TLS encryption/decryption, as if TLS was not
+#       in use at all.
+#
+#       The following format codes are also available for ICAP logs:
+#
+#               icap::<A        ICAP server IP address. Similar to <A.
+#
+#               icap::<service_name     ICAP service name from the icap_service
+#                               option in Squid configuration file.
+#
+#               icap::ru        ICAP Request-URI. Similar to ru.
+#
+#               icap::rm        ICAP request method (REQMOD, RESPMOD, or
+#                               OPTIONS). Similar to existing rm.
+#
+#               icap::>st       The total size of the ICAP request sent to the ICAP
+#                               server (ICAP headers + ICAP body), including chunking
+#                               metadata (if any).
+#
+#               icap::<st       The total size of the ICAP response received from the
+#                               ICAP server (ICAP headers + ICAP body), including
+#                               chunking metadata (if any).
+#
+#               icap::<bs       The size of the ICAP response body received from the
+#                               ICAP server, excluding chunking metadata (if any).
+#
+#               icap::tr        Transaction response time (in
+#                               milliseconds).  The timer starts when
+#                               the ICAP transaction is created and
+#                               stops when the transaction is completed.
+#                               Similar to tr.
+#
+#               icap::tio       Transaction I/O time (in milliseconds). The
+#                               timer starts when the first ICAP request
+#                               byte is scheduled for sending. The timers
+#                               stops when the last byte of the ICAP response
+#                               is received.
+#
+#               icap::to        Transaction outcome: ICAP_ERR* for all
+#                               transaction errors, ICAP_OPT for OPTION
+#                               transactions, ICAP_ECHO for 204
+#                               responses, ICAP_MOD for message
+#                               modification, and ICAP_SAT for request
+#                               satisfaction. Similar to Ss.
+#
+#               icap::Hs        ICAP response status code. Similar to Hs.
+#
+#               icap::>h        ICAP request header(s). Similar to >h.
+#
+#               icap::<h        ICAP response header(s). Similar to <h.
+#
+#       The default ICAP log format, which can be used without an explicit
+#       definition, is called icap_squid:
+#
+#logformat icap_squid %ts.%03tu %6icap::tr %>A %icap::to/%03icap::Hs %icap::<st %icap::rm %icap::ru %un -/%icap::<A -
+#
+#       See also: logformat and %adapt::<last_h
+#Default:
+# none
+
+#  TAG: logfile_daemon
+#       Specify the path to the logfile-writing daemon. This daemon is
+#       used to write the access and store logs, if configured.
+#
+#       Squid sends a number of commands to the log daemon:
+#         L<data>\n - logfile data
+#         R\n - rotate file
+#         T\n - truncate file
+#         O\n - reopen file
+#         F\n - flush file
+#         r<n>\n - set rotate count to <n>
+#         b<n>\n - 1 = buffer output, 0 = don't buffer output
+#
+#       No responses is expected.
+#Default:
+# logfile_daemon /usr/lib/squid/log_file_daemon
+
+#  TAG: stats_collection        allow|deny acl acl...
+#       This options allows you to control which requests gets accounted
+#       in performance counters.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow logging for all transactions.
+
+#  TAG: cache_store_log
+#       Logs the activities of the storage manager.  Shows which
+#       objects are ejected from the cache, and which objects are
+#       saved and for how long.
+#       There are not really utilities to analyze this data, so you can safely
+#       disable it (the default).
+#
+#       Store log uses modular logging outputs. See access_log for the list
+#       of modules supported.
+#
+#       Example:
+#               cache_store_log stdio:/var/log/squid/store.log
+#               cache_store_log daemon:/var/log/squid/store.log
+#Default:
+# none
+
+#  TAG: cache_swap_state
+#       Location for the cache "swap.state" file. This index file holds
+#       the metadata of objects saved on disk.  It is used to rebuild
+#       the cache during startup.  Normally this file resides in each
+#       'cache_dir' directory, but you may specify an alternate
+#       pathname here.  Note you must give a full filename, not just
+#       a directory. Since this is the index for the whole object
+#       list you CANNOT periodically rotate it!
+#
+#       If %s can be used in the file name it will be replaced with a
+#       a representation of the cache_dir name where each / is replaced
+#       with '.'. This is needed to allow adding/removing cache_dir
+#       lines when cache_swap_log is being used.
+#
+#       If have more than one 'cache_dir', and %s is not used in the name
+#       these swap logs will have names such as:
+#
+#               cache_swap_log.00
+#               cache_swap_log.01
+#               cache_swap_log.02
+#
+#       The numbered extension (which is added automatically)
+#       corresponds to the order of the 'cache_dir' lines in this
+#       configuration file.  If you change the order of the 'cache_dir'
+#       lines in this file, these index files will NOT correspond to
+#       the correct 'cache_dir' entry (unless you manually rename
+#       them).  We recommend you do NOT use this option.  It is
+#       better to keep these index files in each 'cache_dir' directory.
+#Default:
+# Store the journal inside its cache_dir
+
+#  TAG: logfile_rotate
+#       Specifies the number of logfile rotations to make when you
+#       type 'squid -k rotate'. The default is 10, which will rotate
+#       with extensions 0 through 9. Setting logfile_rotate to 0 will
+#       disable the file name rotation, but the logfiles are still closed
+#       and re-opened. This will enable you to rename the logfiles
+#       yourself just before sending the rotate signal.
+#
+#       Note, the 'squid -k rotate' command normally sends a USR1
+#       signal to the running squid process.  In certain situations
+#       (e.g. on Linux with Async I/O), USR1 is used for other
+#       purposes, so -k rotate uses another signal.  It is best to get
+#       in the habit of using 'squid -k rotate' instead of 'kill -USR1
+#       <pid>'.
+#
+#       Note, from Squid-3.1 this option is only a default for cache.log,
+#       that log can be rotated separately by using debug_options.
+#
+#       Note2, for Debian/Linux the default of logfile_rotate is
+#       zero, since it includes external logfile-rotation methods.
+#Default:
+# logfile_rotate 0
+
+#  TAG: mime_table
+#       Path to Squid's icon configuration file.
+#
+#       You shouldn't need to change this, but the default file contains
+#       examples and formatting information if you do.
+#Default:
+# mime_table /usr/share/squid/mime.conf
+
+#  TAG: log_mime_hdrs   on|off
+#       The Cache can record both the request and the response MIME
+#       headers for each HTTP transaction.  The headers are encoded
+#       safely and will appear as two bracketed fields at the end of
+#       the access log (for either the native or httpd-emulated log
+#       formats).  To enable this logging set log_mime_hdrs to 'on'.
+#Default:
+# log_mime_hdrs off
+
+#  TAG: pid_filename
+#       A filename to write the process-id to.  To disable, enter "none".
+#Default:
+# pid_filename /var/run/squid.pid
+
+#  TAG: client_netmask
+#       A netmask for client addresses in logfiles and cachemgr output.
+#       Change this to protect the privacy of your cache clients.
+#       A netmask of 255.255.255.0 will log all IP's in that range with
+#       the last digit set to '0'.
+#Default:
+# Log full client IP address
+
+#  TAG: strip_query_terms
+#       By default, Squid strips query terms from requested URLs before
+#       logging.  This protects your user's privacy and reduces log size.
+#
+#       When investigating HIT/MISS or other caching behaviour you
+#       will need to disable this to see the full URL used by Squid.
+#Default:
+# strip_query_terms on
+
+#  TAG: buffered_logs   on|off
+#       Whether to write/send access_log records ASAP or accumulate them and
+#       then write/send them in larger chunks. Buffering may improve
+#       performance because it decreases the number of I/Os. However,
+#       buffering increases the delay before log records become available to
+#       the final recipient (e.g., a disk file or logging daemon) and,
+#       hence, increases the risk of log records loss.
+#
+#       Note that even when buffered_logs are off, Squid may have to buffer
+#       records if it cannot write/send them immediately due to pending I/Os
+#       (e.g., the I/O writing the previous log record) or connectivity loss.
+#
+#       Currently honored by 'daemon' and 'tcp' access_log modules only.
+#Default:
+# buffered_logs off
+
+#  TAG: netdb_filename
+#       Where Squid stores it's netdb journal.
+#       When enabled this journal preserves netdb state between restarts.
+#
+#       To disable, enter "none".
+#Default:
+# netdb_filename stdio:/var/log/squid/netdb.state
+
+# OPTIONS FOR TROUBLESHOOTING
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_log
+#       Squid administrative logging file.
+#
+#       This is where general information about Squid behavior goes. You can
+#       increase the amount of data logged to this file and how often it is
+#       rotated with "debug_options"
+#Default:
+# cache_log /var/log/squid/cache.log
+
+#  TAG: debug_options
+#       Logging options are set as section,level where each source file
+#       is assigned a unique section.  Lower levels result in less
+#       output,  Full debugging (level 9) can result in a very large
+#       log file, so be careful.
+#
+#       The magic word "ALL" sets debugging levels for all sections.
+#       The default is to run with "ALL,1" to record important warnings.
+#
+#       The rotate=N option can be used to keep more or less of these logs
+#       than would otherwise be kept by logfile_rotate.
+#       For most uses a single log should be enough to monitor current
+#       events affecting Squid.
+#Default:
+# Log all critical and important messages.
+
+#  TAG: coredump_dir
+#       By default Squid leaves core files in the directory from where
+#       it was started. If you set 'coredump_dir' to a directory
+#       that exists, Squid will chdir() to that directory at startup
+#       and coredump files will be left there.
+#
+#Default:
+# Use the directory from where Squid was started.
+#
+
+# Leave coredumps in the first cache dir
+coredump_dir /var/spool/squid
+
+# OPTIONS FOR FTP GATEWAYING
+# -----------------------------------------------------------------------------
+
+#  TAG: ftp_user
+#       If you want the anonymous login password to be more informative
+#       (and enable the use of picky FTP servers), set this to something
+#       reasonable for your domain, like wwwuser@somewhere.net
+#
+#       The reason why this is domainless by default is the
+#       request can be made on the behalf of a user in any domain,
+#       depending on how the cache is used.
+#       Some FTP server also validate the email address is valid
+#       (for example perl.com).
+#Default:
+# ftp_user Squid@
+
+#  TAG: ftp_passive
+#       If your firewall does not allow Squid to use passive
+#       connections, turn off this option.
+#
+#       Use of ftp_epsv_all option requires this to be ON.
+#Default:
+# ftp_passive on
+
+#  TAG: ftp_epsv_all
+#       FTP Protocol extensions permit the use of a special "EPSV ALL" command.
+#
+#       NATs may be able to put the connection on a "fast path" through the
+#       translator, as the EPRT command will never be used and therefore,
+#       translation of the data portion of the segments will never be needed.
+#
+#       When a client only expects to do two-way FTP transfers this may be
+#       useful.
+#       If squid finds that it must do a three-way FTP transfer after issuing
+#       an EPSV ALL command, the FTP session will fail.
+#
+#       If you have any doubts about this option do not use it.
+#       Squid will nicely attempt all other connection methods.
+#
+#       Requires ftp_passive to be ON (default) for any effect.
+#Default:
+# ftp_epsv_all off
+
+#  TAG: ftp_epsv
+#       FTP Protocol extensions permit the use of a special "EPSV" command.
+#
+#       NATs may be able to put the connection on a "fast path" through the
+#       translator using EPSV, as the EPRT command will never be used
+#       and therefore, translation of the data portion of the segments
+#       will never be needed.
+#
+#       EPSV is often required to interoperate with FTP servers on IPv6
+#       networks. On the other hand, it may break some IPv4 servers.
+#
+#       By default, EPSV may try EPSV with any FTP server. To fine tune
+#       that decision, you may restrict EPSV to certain clients or servers
+#       using ACLs:
+#
+#               ftp_epsv allow|deny al1 acl2 ...
+#
+#       WARNING: Disabling EPSV may cause problems with external NAT and IPv6.
+#
+#       Only fast ACLs are supported.
+#       Requires ftp_passive to be ON (default) for any effect.
+#Default:
+# none
+
+#  TAG: ftp_eprt
+#       FTP Protocol extensions permit the use of a special "EPRT" command.
+#
+#       This extension provides a protocol neutral alternative to the
+#       IPv4-only PORT command. When supported it enables active FTP data
+#       channels over IPv6 and efficient NAT handling.
+#
+#       Turning this OFF will prevent EPRT being attempted and will skip
+#       straight to using PORT for IPv4 servers.
+#
+#       Some devices are known to not handle this extension correctly and
+#       may result in crashes. Devices which suport EPRT enough to fail
+#       cleanly will result in Squid attempting PORT anyway. This directive
+#       should only be disabled when EPRT results in device failures.
+#
+#       WARNING: Doing so will convert Squid back to the old behavior with all
+#       the related problems with external NAT devices/layers and IPv4-only FTP.
+#Default:
+# ftp_eprt on
+
+#  TAG: ftp_sanitycheck
+#       For security and data integrity reasons Squid by default performs
+#       sanity checks of the addresses of FTP data connections ensure the
+#       data connection is to the requested server. If you need to allow
+#       FTP connections to servers using another IP address for the data
+#       connection turn this off.
+#Default:
+# ftp_sanitycheck on
+
+#  TAG: ftp_telnet_protocol
+#       The FTP protocol is officially defined to use the telnet protocol
+#       as transport channel for the control connection. However, many
+#       implementations are broken and does not respect this aspect of
+#       the FTP protocol.
+#
+#       If you have trouble accessing files with ASCII code 255 in the
+#       path or similar problems involving this ASCII code you can
+#       try setting this directive to off. If that helps, report to the
+#       operator of the FTP server in question that their FTP server
+#       is broken and does not follow the FTP standard.
+#Default:
+# ftp_telnet_protocol on
+
+# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
+# -----------------------------------------------------------------------------
+
+#  TAG: diskd_program
+#       Specify the location of the diskd executable.
+#       Note this is only useful if you have compiled in
+#       diskd as one of the store io modules.
+#Default:
+# diskd_program /usr/lib/squid/diskd
+
+#  TAG: unlinkd_program
+#       Specify the location of the executable for file deletion process.
+#Default:
+# unlinkd_program /usr/lib/squid/unlinkd
+
+#  TAG: pinger_program
+#       Specify the location of the executable for the pinger process.
+#Default:
+# pinger_program /usr/lib/squid/pinger
+
+#  TAG: pinger_enable
+#       Control whether the pinger is active at run-time.
+#       Enables turning ICMP pinger on and off with a simple
+#       squid -k reconfigure.
+#Default:
+# pinger_enable on
+
+# OPTIONS FOR URL REWRITING
+# -----------------------------------------------------------------------------
+
+#  TAG: url_rewrite_program
+#       Specify the location of the executable URL rewriter to use.
+#       Since they can perform almost any function there isn't one included.
+#
+#       For each requested URL, the rewriter will receive on line with the format
+#
+#         [channel-ID <SP>] URL [<SP> extras]<NL>
+#
+#       See url_rewrite_extras on how to send "extras" with optional values to
+#       the helper.
+#       After processing the request the helper must reply using the following format:
+#
+#         [channel-ID <SP>] result [<SP> kv-pairs]
+#
+#       The result code can be:
+#
+#         OK status=30N url="..."
+#               Redirect the URL to the one supplied in 'url='.
+#               'status=' is optional and contains the status code to send
+#               the client in Squids HTTP response. It must be one of the
+#               HTTP redirect status codes: 301, 302, 303, 307, 308.
+#               When no status is given Squid will use 302.
+#
+#         OK rewrite-url="..."
+#               Rewrite the URL to the one supplied in 'rewrite-url='.
+#               The new URL is fetched directly by Squid and returned to
+#               the client as the response to its request.
+#
+#         OK
+#               When neither of url= and rewrite-url= are sent Squid does
+#               not change the URL.
+#
+#         ERR
+#               Do not change the URL.
+#
+#         BH
+#               An internal error occurred in the helper, preventing
+#               a result being identified. The 'message=' key name is
+#               reserved for delivering a log message.
+#
+#
+#       In addition to the above kv-pairs Squid also understands the following
+#       optional kv-pairs received from URL rewriters:
+#         clt_conn_tag=TAG
+#               Associates a TAG with the client TCP connection.
+#               The TAG is treated as a regular annotation but persists across
+#               future requests on the client connection rather than just the
+#               current request. A helper may update the TAG during subsequent
+#               requests be returning a new kv-pair.
+#
+#       When using the concurrency= option the protocol is changed by
+#       introducing a query channel tag in front of the request/response.
+#       The query channel tag is a number between 0 and concurrency-1.
+#       This value must be echoed back unchanged to Squid as the first part
+#       of the response relating to its request.
+#
+#       WARNING: URL re-writing ability should be avoided whenever possible.
+#                Use the URL redirect form of response instead.
+#
+#       Re-write creates a difference in the state held by the client
+#       and server. Possibly causing confusion when the server response
+#       contains snippets of its view state. Embeded URLs, response
+#       and content Location headers, etc. are not re-written by this
+#       interface.
+#
+#       By default, a URL rewriter is not used.
+#Default:
+# none
+
+#  TAG: url_rewrite_children
+#       The maximum number of redirector processes to spawn. If you limit
+#       it too few Squid will have to wait for them to process a backlog of
+#       URLs, slowing it down. If you allow too many they will use RAM
+#       and other system resources noticably.
+#
+#       The startup= and idle= options allow some measure of skew in your
+#       tuning.
+#
+#               startup=
+#
+#       Sets a minimum of how many processes are to be spawned when Squid
+#       starts or reconfigures. When set to zero the first request will
+#       cause spawning of the first child process to handle it.
+#
+#       Starting too few will cause an initial slowdown in traffic as Squid
+#       attempts to simultaneously spawn enough processes to cope.
+#
+#               idle=
+#
+#       Sets a minimum of how many processes Squid is to try and keep available
+#       at all times. When traffic begins to rise above what the existing
+#       processes can handle this many more will be spawned up to the maximum
+#       configured. A minimum setting of 1 is required.
+#
+#               concurrency=
+#
+#       The number of requests each redirector helper can handle in
+#       parallel. Defaults to 0 which indicates the redirector
+#       is a old-style single threaded redirector.
+#
+#       When this directive is set to a value >= 1 then the protocol
+#       used to communicate with the helper is modified to include
+#       an ID in front of the request/response. The ID from the request
+#       must be echoed back with the response to that request.
+#Default:
+# url_rewrite_children 20 startup=0 idle=1 concurrency=0
+
+#  TAG: url_rewrite_host_header
+#       To preserve same-origin security policies in browsers and
+#       prevent Host: header forgery by redirectors Squid rewrites
+#       any Host: header in redirected requests.
+#
+#       If you are running an accelerator this may not be a wanted
+#       effect of a redirector. This directive enables you disable
+#       Host: alteration in reverse-proxy traffic.
+#
+#       WARNING: Entries are cached on the result of the URL rewriting
+#       process, so be careful if you have domain-virtual hosts.
+#
+#       WARNING: Squid and other software verifies the URL and Host
+#       are matching, so be careful not to relay through other proxies
+#       or inspecting firewalls with this disabled.
+#Default:
+# url_rewrite_host_header on
+
+#  TAG: url_rewrite_access
+#       If defined, this access list specifies which requests are
+#       sent to the redirector processes.
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: url_rewrite_bypass
+#       When this is 'on', a request will not go through the
+#       redirector if all the helpers are busy.  If this is 'off'
+#       and the redirector queue grows too large, Squid will exit
+#       with a FATAL error and ask you to increase the number of
+#       redirectors.  You should only enable this if the redirectors
+#       are not critical to your caching system.  If you use
+#       redirectors for access control, and you enable this option,
+#       users may have access to pages they should not
+#       be allowed to request.
+#Default:
+# url_rewrite_bypass off
+
+#  TAG: url_rewrite_extras
+#       Specifies a string to be append to request line format for the
+#       rewriter helper. "Quoted" format values may contain spaces and
+#       logformat %macros. In theory, any logformat %macro can be used.
+#       In practice, a %macro expands as a dash (-) if the helper request is
+#       sent before the required macro information is available to Squid.
+#Default:
+# url_rewrite_extras "%>a/%>A %un %>rm myip=%la myport=%lp"
+
+# OPTIONS FOR STORE ID
+# -----------------------------------------------------------------------------
+
+#  TAG: store_id_program
+#       Specify the location of the executable StoreID helper to use.
+#       Since they can perform almost any function there isn't one included.
+#
+#       For each requested URL, the helper will receive one line with the format
+#
+#         [channel-ID <SP>] URL [<SP> extras]<NL>
+#
+#
+#       After processing the request the helper must reply using the following format:
+#
+#         [channel-ID <SP>] result [<SP> kv-pairs]
+#
+#       The result code can be:
+#
+#         OK store-id="..."
+#               Use the StoreID supplied in 'store-id='.
+#
+#         ERR
+#               The default is to use HTTP request URL as the store ID.
+#
+#         BH
+#               An internal error occured in the helper, preventing
+#               a result being identified.
+#
+#       In addition to the above kv-pairs Squid also understands the following
+#       optional kv-pairs received from URL rewriters:
+#         clt_conn_tag=TAG
+#               Associates a TAG with the client TCP connection.
+#               Please see url_rewrite_program related documentation for this
+#               kv-pair
+#
+#       Helper programs should be prepared to receive and possibly ignore
+#       additional whitespace-separated tokens on each input line.
+#
+#       When using the concurrency= option the protocol is changed by
+#       introducing a query channel tag in front of the request/response.
+#       The query channel tag is a number between 0 and concurrency-1.
+#       This value must be echoed back unchanged to Squid as the first part
+#       of the response relating to its request.
+#
+#       NOTE: when using StoreID refresh_pattern will apply to the StoreID
+#             returned from the helper and not the URL.
+#
+#       WARNING: Wrong StoreID value returned by a careless helper may result
+#                in the wrong cached response returned to the user.
+#
+#       By default, a StoreID helper is not used.
+#Default:
+# none
+
+#  TAG: store_id_extras
+#        Specifies a string to be append to request line format for the
+#        StoreId helper. "Quoted" format values may contain spaces and
+#        logformat %macros. In theory, any logformat %macro can be used.
+#        In practice, a %macro expands as a dash (-) if the helper request is
+#        sent before the required macro information is available to Squid.
+#Default:
+# store_id_extras "%>a/%>A %un %>rm myip=%la myport=%lp"
+
+#  TAG: store_id_children
+#       The maximum number of StoreID helper processes to spawn. If you limit
+#       it too few Squid will have to wait for them to process a backlog of
+#       requests, slowing it down. If you allow too many they will use RAM
+#       and other system resources noticably.
+#
+#       The startup= and idle= options allow some measure of skew in your
+#       tuning.
+#
+#               startup=
+#
+#       Sets a minimum of how many processes are to be spawned when Squid
+#       starts or reconfigures. When set to zero the first request will
+#       cause spawning of the first child process to handle it.
+#
+#       Starting too few will cause an initial slowdown in traffic as Squid
+#       attempts to simultaneously spawn enough processes to cope.
+#
+#               idle=
+#
+#       Sets a minimum of how many processes Squid is to try and keep available
+#       at all times. When traffic begins to rise above what the existing
+#       processes can handle this many more will be spawned up to the maximum
+#       configured. A minimum setting of 1 is required.
+#
+#               concurrency=
+#
+#       The number of requests each storeID helper can handle in
+#       parallel. Defaults to 0 which indicates the helper
+#       is a old-style single threaded program.
+#
+#       When this directive is set to a value >= 1 then the protocol
+#       used to communicate with the helper is modified to include
+#       an ID in front of the request/response. The ID from the request
+#       must be echoed back with the response to that request.
+#Default:
+# store_id_children 20 startup=0 idle=1 concurrency=0
+
+#  TAG: store_id_access
+#       If defined, this access list specifies which requests are
+#       sent to the StoreID processes.  By default all requests
+#       are sent.
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: store_id_bypass
+#       When this is 'on', a request will not go through the
+#       helper if all helpers are busy.  If this is 'off'
+#       and the helper queue grows too large, Squid will exit
+#       with a FATAL error and ask you to increase the number of
+#       helpers.  You should only enable this if the helperss
+#       are not critical to your caching system.  If you use
+#       helpers for critical caching components, and you enable this
+#       option, users may not get objects from cache.
+#Default:
+# store_id_bypass on
+
+# OPTIONS FOR TUNING THE CACHE
+# -----------------------------------------------------------------------------
+
+#  TAG: cache
+#       Requests denied by this directive will not be served from the cache
+#       and their responses will not be stored in the cache. This directive
+#       has no effect on other transactions and on already cached responses.
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#       This and the two other similar caching directives listed below are
+#       checked at different transaction processing stages, have different
+#       access to response information, affect different cache operations,
+#       and differ in slow ACLs support:
+#
+#       * cache: Checked before Squid makes a hit/miss determination.
+#               No access to reply information!
+#               Denies both serving a hit and storing a miss.
+#               Supports both fast and slow ACLs.
+#       * send_hit: Checked after a hit was detected.
+#               Has access to reply (hit) information.
+#               Denies serving a hit only.
+#               Supports fast ACLs only.
+#       * store_miss: Checked before storing a cachable miss.
+#               Has access to reply (miss) information.
+#               Denies storing a miss only.
+#               Supports fast ACLs only.
+#
+#       If you are not sure which of the three directives to use, apply the
+#       following decision logic:
+#
+#       * If your ACL(s) are of slow type _and_ need response info, redesign.
+#         Squid does not support that particular combination at this time.
+#        Otherwise:
+#       * If your directive ACL(s) are of slow type, use "cache"; and/or
+#       * if your directive ACL(s) need no response info, use "cache".
+#        Otherwise:
+#       * If you do not want the response cached, use store_miss; and/or
+#       * if you do not want a hit on a cached response, use send_hit.
+#Default:
+# By default, this directive is unused and has no effect.
+
+#  TAG: send_hit
+#       Responses denied by this directive will not be served from the cache
+#       (but may still be cached, see store_miss). This directive has no
+#       effect on the responses it allows and on the cached objects.
+#
+#       Please see the "cache" directive for a summary of differences among
+#       store_miss, send_hit, and cache directives.
+#
+#       Unlike the "cache" directive, send_hit only supports fast acl
+#       types.  See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#       For example:
+#
+#               # apply custom Store ID mapping to some URLs
+#               acl MapMe dstdomain .c.example.com
+#               store_id_program ...
+#               store_id_access allow MapMe
+#
+#               # but prevent caching of special responses
+#               # such as 302 redirects that cause StoreID loops
+#               acl Ordinary http_status 200-299
+#               store_miss deny MapMe !Ordinary
+#
+#               # and do not serve any previously stored special responses
+#               # from the cache (in case they were already cached before
+#               # the above store_miss rule was in effect).
+#               send_hit deny MapMe !Ordinary
+#Default:
+# By default, this directive is unused and has no effect.
+
+#  TAG: store_miss
+#       Responses denied by this directive will not be cached (but may still
+#       be served from the cache, see send_hit). This directive has no
+#       effect on the responses it allows and on the already cached responses.
+#
+#       Please see the "cache" directive for a summary of differences among
+#       store_miss, send_hit, and cache directives. See the
+#       send_hit directive for a usage example.
+#
+#       Unlike the "cache" directive, store_miss only supports fast acl
+#       types.  See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# By default, this directive is unused and has no effect.
+
+#  TAG: max_stale       time-units
+#       This option puts an upper limit on how stale content Squid
+#       will serve from the cache if cache validation fails.
+#       Can be overriden by the refresh_pattern max-stale option.
+#Default:
+# max_stale 1 week
+
+#  TAG: refresh_pattern
+#       usage: refresh_pattern [-i] regex min percent max [options]
+#
+#       By default, regular expressions are CASE-SENSITIVE.  To make
+#       them case-insensitive, use the -i option.
+#
+#       'Min' is the time (in minutes) an object without an explicit
+#       expiry time should be considered fresh. The recommended
+#       value is 0, any higher values may cause dynamic applications
+#       to be erroneously cached unless the application designer
+#       has taken the appropriate actions.
+#
+#       'Percent' is a percentage of the objects age (time since last
+#       modification age) an object without explicit expiry time
+#       will be considered fresh.
+#
+#       'Max' is an upper limit on how long objects without an explicit
+#       expiry time will be considered fresh. The value is also used
+#       to form Cache-Control: max-age header for a request sent from
+#       Squid to origin/parent.
+#
+#       options: override-expire
+#                override-lastmod
+#                reload-into-ims
+#                ignore-reload
+#                ignore-no-store
+#                ignore-must-revalidate
+#                ignore-private
+#                ignore-auth
+#                max-stale=NN
+#                refresh-ims
+#                store-stale
+#
+#               override-expire enforces min age even if the server
+#               sent an explicit expiry time (e.g., with the
+#               Expires: header or Cache-Control: max-age). Doing this
+#               VIOLATES the HTTP standard.  Enabling this feature
+#               could make you liable for problems which it causes.
+#
+#               Note: override-expire does not enforce staleness - it only extends
+#               freshness / min. If the server returns a Expires time which
+#               is longer than your max time, Squid will still consider
+#               the object fresh for that period of time.
+#
+#               override-lastmod enforces min age even on objects
+#               that were modified recently.
+#
+#               reload-into-ims changes a client no-cache or ``reload''
+#               request for a cached entry into a conditional request using
+#               If-Modified-Since and/or If-None-Match headers, provided the
+#               cached entry has a Last-Modified and/or a strong ETag header.
+#               Doing this VIOLATES the HTTP standard. Enabling this feature
+#               could make you liable for problems which it causes.
+#
+#               ignore-reload ignores a client no-cache or ``reload''
+#               header. Doing this VIOLATES the HTTP standard. Enabling
+#               this feature could make you liable for problems which
+#               it causes.
+#
+#               ignore-no-store ignores any ``Cache-control: no-store''
+#               headers received from a server. Doing this VIOLATES
+#               the HTTP standard. Enabling this feature could make you
+#               liable for problems which it causes.
+#
+#               ignore-must-revalidate ignores any ``Cache-Control: must-revalidate``
+#               headers received from a server. Doing this VIOLATES
+#               the HTTP standard. Enabling this feature could make you
+#               liable for problems which it causes.
+#
+#               ignore-private ignores any ``Cache-control: private''
+#               headers received from a server. Doing this VIOLATES
+#               the HTTP standard. Enabling this feature could make you
+#               liable for problems which it causes.
+#
+#               ignore-auth caches responses to requests with authorization,
+#               as if the originserver had sent ``Cache-control: public''
+#               in the response header. Doing this VIOLATES the HTTP standard.
+#               Enabling this feature could make you liable for problems which
+#               it causes.
+#
+#               refresh-ims causes squid to contact the origin server
+#               when a client issues an If-Modified-Since request. This
+#               ensures that the client will receive an updated version
+#               if one is available.
+#
+#               store-stale stores responses even if they don't have explicit
+#               freshness or a validator (i.e., Last-Modified or an ETag)
+#               present, or if they're already stale. By default, Squid will
+#               not cache such responses because they usually can't be
+#               reused. Note that such responses will be stale by default.
+#
+#               max-stale=NN provide a maximum staleness factor. Squid won't
+#               serve objects more stale than this even if it failed to
+#               validate the object. Default: use the max_stale global limit.
+#
+#       Basically a cached object is:
+#
+#               FRESH if expire > now, else STALE
+#               STALE if age > max
+#               FRESH if lm-factor < percent, else STALE
+#               FRESH if age < min
+#               else STALE
+#
+#       The refresh_pattern lines are checked in the order listed here.
+#       The first entry which matches is used.  If none of the entries
+#       match the default will be used.
+#
+#       Note, you must uncomment all the default lines if you want
+#       to change one. The default setting is only active if none is
+#       used.
+#
+#
+
+#
+# Add any of your own refresh_pattern entries above these.
+#
+refresh_pattern ^ftp:           1440    20%     10080
+refresh_pattern ^gopher:        1440    0%      1440
+refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
+refresh_pattern (Release|Packages(.gz)*)$      0       20%     2880
+# example lin deb packages
+#refresh_pattern (\.deb|\.udeb)$   129600 100% 129600
+refresh_pattern .               0       20%     4320
+
+#  TAG: quick_abort_min (KB)
+#Default:
+# quick_abort_min 16 KB
+
+#  TAG: quick_abort_max (KB)
+#Default:
+# quick_abort_max 16 KB
+
+#  TAG: quick_abort_pct (percent)
+#       The cache by default continues downloading aborted requests
+#       which are almost completed (less than 16 KB remaining). This
+#       may be undesirable on slow (e.g. SLIP) links and/or very busy
+#       caches.  Impatient users may tie up file descriptors and
+#       bandwidth by repeatedly requesting and immediately aborting
+#       downloads.
+#
+#       When the user aborts a request, Squid will check the
+#       quick_abort values to the amount of data transferred until
+#       then.
+#
+#       If the transfer has less than 'quick_abort_min' KB remaining,
+#       it will finish the retrieval.
+#
+#       If the transfer has more than 'quick_abort_max' KB remaining,
+#       it will abort the retrieval.
+#
+#       If more than 'quick_abort_pct' of the transfer has completed,
+#       it will finish the retrieval.
+#
+#       If you do not want any retrieval to continue after the client
+#       has aborted, set both 'quick_abort_min' and 'quick_abort_max'
+#       to '0 KB'.
+#
+#       If you want retrievals to always continue if they are being
+#       cached set 'quick_abort_min' to '-1 KB'.
+#Default:
+# quick_abort_pct 95
+
+#  TAG: read_ahead_gap  buffer-size
+#       The amount of data the cache will buffer ahead of what has been
+#       sent to the client when retrieving an object from another server.
+#Default:
+# read_ahead_gap 16 KB
+
+#  TAG: negative_ttl    time-units
+#       Set the Default Time-to-Live (TTL) for failed requests.
+#       Certain types of failures (such as "connection refused" and
+#       "404 Not Found") are able to be negatively-cached for a short time.
+#       Modern web servers should provide Expires: header, however if they
+#       do not this can provide a minimum TTL.
+#       The default is not to cache errors with unknown expiry details.
+#
+#       Note that this is different from negative caching of DNS lookups.
+#
+#       WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#       this feature could make you liable for problems which it
+#       causes.
+#Default:
+# negative_ttl 0 seconds
+
+#  TAG: positive_dns_ttl        time-units
+#       Upper limit on how long Squid will cache positive DNS responses.
+#       Default is 6 hours (360 minutes). This directive must be set
+#       larger than negative_dns_ttl.
+#Default:
+# positive_dns_ttl 6 hours
+
+#  TAG: negative_dns_ttl        time-units
+#       Time-to-Live (TTL) for negative caching of failed DNS lookups.
+#       This also sets the lower cache limit on positive lookups.
+#       Minimum value is 1 second, and it is not recommendable to go
+#       much below 10 seconds.
+#Default:
+# negative_dns_ttl 1 minutes
+
+#  TAG: range_offset_limit      size [acl acl...]
+#       usage: (size) [units] [[!]aclname]
+#
+#       Sets an upper limit on how far (number of bytes) into the file
+#       a Range request may be to cause Squid to prefetch the whole file.
+#       If beyond this limit, Squid forwards the Range request as it is and
+#       the result is NOT cached.
+#
+#       This is to stop a far ahead range request (lets say start at 17MB)
+#       from making Squid fetch the whole object up to that point before
+#       sending anything to the client.
+#
+#       Multiple range_offset_limit lines may be specified, and they will
+#       be searched from top to bottom on each request until a match is found.
+#       The first match found will be used.  If no line matches a request, the
+#       default limit of 0 bytes will be used.
+#
+#       'size' is the limit specified as a number of units.
+#
+#       'units' specifies whether to use bytes, KB, MB, etc.
+#       If no units are specified bytes are assumed.
+#
+#       A size of 0 causes Squid to never fetch more than the
+#       client requested. (default)
+#
+#       A size of 'none' causes Squid to always fetch the object from the
+#       beginning so it may cache the result. (2.0 style)
+#
+#       'aclname' is the name of a defined ACL.
+#
+#       NP: Using 'none' as the byte value here will override any quick_abort settings
+#           that may otherwise apply to the range request. The range request will
+#           be fully fetched from start to finish regardless of the client
+#           actions. This affects bandwidth usage.
+#Default:
+# none
+
+#  TAG: minimum_expiry_time     (seconds)
+#       The minimum caching time according to (Expires - Date)
+#       headers Squid honors if the object can't be revalidated.
+#       The default is 60 seconds.
+#
+#       In reverse proxy environments it might be desirable to honor
+#       shorter object lifetimes. It is most likely better to make
+#       your server return a meaningful Last-Modified header however.
+#
+#       In ESI environments where page fragments often have short
+#       lifetimes, this will often be best set to 0.
+#Default:
+# minimum_expiry_time 60 seconds
+
+#  TAG: store_avg_object_size   (bytes)
+#       Average object size, used to estimate number of objects your
+#       cache can hold.  The default is 13 KB.
+#
+#       This is used to pre-seed the cache index memory allocation to
+#       reduce expensive reallocate operations while handling clients
+#       traffic. Too-large values may result in memory allocation during
+#       peak traffic, too-small values will result in wasted memory.
+#
+#       Check the cache manager 'info' report metrics for the real
+#       object sizes seen by your Squid before tuning this.
+#Default:
+# store_avg_object_size 13 KB
+
+#  TAG: store_objects_per_bucket
+#       Target number of objects per bucket in the store hash table.
+#       Lowering this value increases the total number of buckets and
+#       also the storage maintenance rate.  The default is 20.
+#Default:
+# store_objects_per_bucket 20
+
+# HTTP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: request_header_max_size (KB)
+#       This specifies the maximum size for HTTP headers in a request.
+#       Request headers are usually relatively small (about 512 bytes).
+#       Placing a limit on the request header size will catch certain
+#       bugs (for example with persistent connections) and possibly
+#       buffer-overflow or denial-of-service attacks.
+#Default:
+# request_header_max_size 64 KB
+
+#  TAG: reply_header_max_size   (KB)
+#       This specifies the maximum size for HTTP headers in a reply.
+#       Reply headers are usually relatively small (about 512 bytes).
+#       Placing a limit on the reply header size will catch certain
+#       bugs (for example with persistent connections) and possibly
+#       buffer-overflow or denial-of-service attacks.
+#Default:
+# reply_header_max_size 64 KB
+
+#  TAG: request_body_max_size   (bytes)
+#       This specifies the maximum size for an HTTP request body.
+#       In other words, the maximum size of a PUT/POST request.
+#       A user who attempts to send a request with a body larger
+#       than this limit receives an "Invalid Request" error message.
+#       If you set this parameter to a zero (the default), there will
+#       be no limit imposed.
+#
+#       See also client_request_buffer_max_size for an alternative
+#       limitation on client uploads which can be configured.
+#Default:
+# No limit.
+
+#  TAG: client_request_buffer_max_size  (bytes)
+#       This specifies the maximum buffer size of a client request.
+#       It prevents squid eating too much memory when somebody uploads
+#       a large file.
+#Default:
+# client_request_buffer_max_size 512 KB
+
+#  TAG: broken_posts
+#       A list of ACL elements which, if matched, causes Squid to send
+#       an extra CRLF pair after the body of a PUT/POST request.
+#
+#       Some HTTP servers has broken implementations of PUT/POST,
+#       and rely on an extra CRLF pair sent by some WWW clients.
+#
+#       Quote from RFC2616 section 4.1 on this matter:
+#
+#         Note: certain buggy HTTP/1.0 client implementations generate an
+#         extra CRLF's after a POST request. To restate what is explicitly
+#         forbidden by the BNF, an HTTP/1.1 client must not preface or follow
+#         a request with an extra CRLF.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#Example:
+# acl buggy_server url_regex ^http://....
+# broken_posts allow buggy_server
+#Default:
+# Obey RFC 2616.
+
+#  TAG: adaptation_uses_indirect_client on|off
+#       Controls whether the indirect client IP address (instead of the direct
+#       client IP address) is passed to adaptation services.
+#
+#       See also: follow_x_forwarded_for adaptation_send_client_ip
+#Default:
+# adaptation_uses_indirect_client on
+
+#  TAG: via     on|off
+#       If set (default), Squid will include a Via header in requests and
+#       replies as required by RFC2616.
+#Default:
+# via on
+
+#  TAG: ie_refresh      on|off
+#       Microsoft Internet Explorer up until version 5.5 Service
+#       Pack 1 has an issue with transparent proxies, wherein it
+#       is impossible to force a refresh.  Turning this on provides
+#       a partial fix to the problem, by causing all IMS-REFRESH
+#       requests from older IE versions to check the origin server
+#       for fresh content.  This reduces hit ratio by some amount
+#       (~10% in my experience), but allows users to actually get
+#       fresh content when they want it.  Note because Squid
+#       cannot tell if the user is using 5.5 or 5.5SP1, the behavior
+#       of 5.5 is unchanged from old versions of Squid (i.e. a
+#       forced refresh is impossible).  Newer versions of IE will,
+#       hopefully, continue to have the new behavior and will be
+#       handled based on that assumption.  This option defaults to
+#       the old Squid behavior, which is better for hit ratios but
+#       worse for clients using IE, if they need to be able to
+#       force fresh content.
+#Default:
+# ie_refresh off
+
+#  TAG: vary_ignore_expire      on|off
+#       Many HTTP servers supporting Vary gives such objects
+#       immediate expiry time with no cache-control header
+#       when requested by a HTTP/1.0 client. This option
+#       enables Squid to ignore such expiry times until
+#       HTTP/1.1 is fully implemented.
+#
+#       WARNING: If turned on this may eventually cause some
+#       varying objects not intended for caching to get cached.
+#Default:
+# vary_ignore_expire off
+
+#  TAG: request_entities
+#       Squid defaults to deny GET and HEAD requests with request entities,
+#       as the meaning of such requests are undefined in the HTTP standard
+#       even if not explicitly forbidden.
+#
+#       Set this directive to on if you have clients which insists
+#       on sending request entities in GET or HEAD requests. But be warned
+#       that there is server software (both proxies and web servers) which
+#       can fail to properly process this kind of request which may make you
+#       vulnerable to cache pollution attacks if enabled.
+#Default:
+# request_entities off
+
+#  TAG: request_header_access
+#       Usage: request_header_access header_name allow|deny [!]aclname ...
+#
+#       WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#       this feature could make you liable for problems which it
+#       causes.
+#
+#       This option replaces the old 'anonymize_headers' and the
+#       older 'http_anonymizer' option with something that is much
+#       more configurable. A list of ACLs for each header name allows
+#       removal of specific header fields under specific conditions.
+#
+#       This option only applies to outgoing HTTP request headers (i.e.,
+#       headers sent by Squid to the next HTTP hop such as a cache peer
+#       or an origin server). The option has no effect during cache hit
+#       detection. The equivalent adaptation vectoring point in ICAP
+#       terminology is post-cache REQMOD.
+#
+#       The option is applied to individual outgoing request header
+#       fields. For each request header field F, Squid uses the first
+#       qualifying sets of request_header_access rules:
+#
+#           1. Rules with header_name equal to F's name.
+#           2. Rules with header_name 'Other', provided F's name is not
+#              on the hard-coded list of commonly used HTTP header names.
+#           3. Rules with header_name 'All'.
+#
+#       Within that qualifying rule set, rule ACLs are checked as usual.
+#       If ACLs of an "allow" rule match, the header field is allowed to
+#       go through as is. If ACLs of a "deny" rule match, the header is
+#       removed and request_header_replace is then checked to identify
+#       if the removed header has a replacement. If no rules within the
+#       set have matching ACLs, the header field is left as is.
+#
+#       For example, to achieve the same behavior as the old
+#       'http_anonymizer standard' option, you should use:
+#
+#               request_header_access From deny all
+#               request_header_access Referer deny all
+#               request_header_access User-Agent deny all
+#
+#       Or, to reproduce the old 'http_anonymizer paranoid' feature
+#       you should use:
+#
+#               request_header_access Authorization allow all
+#               request_header_access Proxy-Authorization allow all
+#               request_header_access Cache-Control allow all
+#               request_header_access Content-Length allow all
+#               request_header_access Content-Type allow all
+#               request_header_access Date allow all
+#               request_header_access Host allow all
+#               request_header_access If-Modified-Since allow all
+#               request_header_access Pragma allow all
+#               request_header_access Accept allow all
+#               request_header_access Accept-Charset allow all
+#               request_header_access Accept-Encoding allow all
+#               request_header_access Accept-Language allow all
+#               request_header_access Connection allow all
+#               request_header_access All deny all
+#
+#       HTTP reply headers are controlled with the reply_header_access directive.
+#
+#       By default, all headers are allowed (no anonymizing is performed).
+#Default:
+# No limits.
+
+#  TAG: reply_header_access
+#       Usage: reply_header_access header_name allow|deny [!]aclname ...
+#
+#       WARNING: Doing this VIOLATES the HTTP standard.  Enabling
+#       this feature could make you liable for problems which it
+#       causes.
+#
+#       This option only applies to reply headers, i.e., from the
+#       server to the client.
+#
+#       This is the same as request_header_access, but in the other
+#       direction. Please see request_header_access for detailed
+#       documentation.
+#
+#       For example, to achieve the same behavior as the old
+#       'http_anonymizer standard' option, you should use:
+#
+#               reply_header_access Server deny all
+#               reply_header_access WWW-Authenticate deny all
+#               reply_header_access Link deny all
+#
+#       Or, to reproduce the old 'http_anonymizer paranoid' feature
+#       you should use:
+#
+#               reply_header_access Allow allow all
+#               reply_header_access WWW-Authenticate allow all
+#               reply_header_access Proxy-Authenticate allow all
+#               reply_header_access Cache-Control allow all
+#               reply_header_access Content-Encoding allow all
+#               reply_header_access Content-Length allow all
+#               reply_header_access Content-Type allow all
+#               reply_header_access Date allow all
+#               reply_header_access Expires allow all
+#               reply_header_access Last-Modified allow all
+#               reply_header_access Location allow all
+#               reply_header_access Pragma allow all
+#               reply_header_access Content-Language allow all
+#               reply_header_access Retry-After allow all
+#               reply_header_access Title allow all
+#               reply_header_access Content-Disposition allow all
+#               reply_header_access Connection allow all
+#               reply_header_access All deny all
+#
+#       HTTP request headers are controlled with the request_header_access directive.
+#
+#       By default, all headers are allowed (no anonymizing is
+#       performed).
+#Default:
+# No limits.
+
+#  TAG: request_header_replace
+#       Usage:   request_header_replace header_name message
+#       Example: request_header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit)
+#
+#       This option allows you to change the contents of headers
+#       denied with request_header_access above, by replacing them
+#       with some fixed string.
+#
+#       This only applies to request headers, not reply headers.
+#
+#       By default, headers are removed if denied.
+#Default:
+# none
+
+#  TAG: reply_header_replace
+#        Usage:   reply_header_replace header_name message
+#        Example: reply_header_replace Server Foo/1.0
+#
+#        This option allows you to change the contents of headers
+#        denied with reply_header_access above, by replacing them
+#        with some fixed string.
+#
+#        This only applies to reply headers, not request headers.
+#
+#        By default, headers are removed if denied.
+#Default:
+# none
+
+#  TAG: request_header_add
+#       Usage:   request_header_add field-name field-value acl1 [acl2] ...
+#       Example: request_header_add X-Client-CA "CA=%ssl::>cert_issuer" all
+#
+#       This option adds header fields to outgoing HTTP requests (i.e.,
+#       request headers sent by Squid to the next HTTP hop such as a
+#       cache peer or an origin server). The option has no effect during
+#       cache hit detection. The equivalent adaptation vectoring point
+#       in ICAP terminology is post-cache REQMOD.
+#
+#       Field-name is a token specifying an HTTP header name. If a
+#       standard HTTP header name is used, Squid does not check whether
+#       the new header conflicts with any existing headers or violates
+#       HTTP rules. If the request to be modified already contains a
+#       field with the same name, the old field is preserved but the
+#       header field values are not merged.
+#
+#       Field-value is either a token or a quoted string. If quoted
+#       string format is used, then the surrounding quotes are removed
+#       while escape sequences and %macros are processed.
+#
+#       In theory, all of the logformat codes can be used as %macros.
+#       However, unlike logging (which happens at the very end of
+#       transaction lifetime), the transaction may not yet have enough
+#       information to expand a macro when the new header value is needed.
+#       And some information may already be available to Squid but not yet
+#       committed where the macro expansion code can access it (report
+#       such instances!). The macro will be expanded into a single dash
+#       ('-') in such cases. Not all macros have been tested.
+#
+#       One or more Squid ACLs may be specified to restrict header
+#       injection to matching requests. As always in squid.conf, all
+#       ACLs in an option ACL list must be satisfied for the insertion
+#       to happen. The request_header_add option supports fast ACLs
+#       only.
+#Default:
+# none
+
+#  TAG: note
+#       This option used to log custom information about the master
+#       transaction. For example, an admin may configure Squid to log
+#       which "user group" the transaction belongs to, where "user group"
+#       will be determined based on a set of ACLs and not [just]
+#       authentication information.
+#       Values of key/value pairs can be logged using %{key}note macros:
+#
+#           note key value acl ...
+#           logformat myFormat ... %{key}note ...
+#Default:
+# none
+
+#  TAG: relaxed_header_parser   on|off|warn
+#       In the default "on" setting Squid accepts certain forms
+#       of non-compliant HTTP messages where it is unambiguous
+#       what the sending application intended even if the message
+#       is not correctly formatted. The messages is then normalized
+#       to the correct form when forwarded by Squid.
+#
+#       If set to "warn" then a warning will be emitted in cache.log
+#       each time such HTTP error is encountered.
+#
+#       If set to "off" then such HTTP errors will cause the request
+#       or response to be rejected.
+#Default:
+# relaxed_header_parser on
+
+#  TAG: collapsed_forwarding    (on|off)
+#       When enabled, instead of forwarding each concurrent request for
+#       the same URL, Squid just sends the first of them. The other, so
+#       called "collapsed" requests, wait for the response to the first
+#       request and, if it happens to be cachable, use that response.
+#       Here, "concurrent requests" means "received after the first
+#       request headers were parsed and before the corresponding response
+#       headers were parsed".
+#
+#       This feature is disabled by default: enabling collapsed
+#       forwarding needlessly delays forwarding requests that look
+#       cachable (when they are collapsed) but then need to be forwarded
+#       individually anyway because they end up being for uncachable
+#       content. However, in some cases, such as acceleration of highly
+#       cachable content with periodic or grouped expiration times, the
+#       gains from collapsing [large volumes of simultaneous refresh
+#       requests] outweigh losses from such delays.
+#
+#       Squid collapses two kinds of requests: regular client requests
+#       received on one of the listening ports and internal "cache
+#       revalidation" requests which are triggered by those regular
+#       requests hitting a stale cached object. Revalidation collapsing
+#       is currently disabled for Squid instances containing SMP-aware
+#       disk or memory caches and for Vary-controlled cached objects.
+#Default:
+# collapsed_forwarding off
+
+# TIMEOUTS
+# -----------------------------------------------------------------------------
+
+#  TAG: forward_timeout time-units
+#       This parameter specifies how long Squid should at most attempt in
+#       finding a forwarding path for the request before giving up.
+#Default:
+# forward_timeout 4 minutes
+
+#  TAG: connect_timeout time-units
+#       This parameter specifies how long to wait for the TCP connect to
+#       the requested server or peer to complete before Squid should
+#       attempt to find another path where to forward the request.
+#Default:
+# connect_timeout 1 minute
+
+#  TAG: peer_connect_timeout    time-units
+#       This parameter specifies how long to wait for a pending TCP
+#       connection to a peer cache.  The default is 30 seconds.   You
+#       may also set different timeout values for individual neighbors
+#       with the 'connect-timeout' option on a 'cache_peer' line.
+#Default:
+# peer_connect_timeout 30 seconds
+
+#  TAG: read_timeout    time-units
+#       Applied on peer server connections.
+#
+#       After each successful read(), the timeout will be extended by this
+#       amount.  If no data is read again after this amount of time,
+#       the request is aborted and logged with ERR_READ_TIMEOUT.
+#
+#       The default is 15 minutes.
+#Default:
+# read_timeout 15 minutes
+
+#  TAG: write_timeout   time-units
+#       This timeout is tracked for all connections that have data
+#       available for writing and are waiting for the socket to become
+#       ready. After each successful write, the timeout is extended by
+#       the configured amount. If Squid has data to write but the
+#       connection is not ready for the configured duration, the
+#       transaction associated with the connection is terminated. The
+#       default is 15 minutes.
+#Default:
+# write_timeout 15 minutes
+
+#  TAG: request_timeout
+#       How long to wait for complete HTTP request headers after initial
+#       connection establishment.
+#Default:
+# request_timeout 5 minutes
+
+#  TAG: client_idle_pconn_timeout
+#       How long to wait for the next HTTP request on a persistent
+#       client connection after the previous request completes.
+#Default:
+# client_idle_pconn_timeout 2 minutes
+
+#  TAG: ftp_client_idle_timeout
+#       How long to wait for an FTP request on a connection to Squid ftp_port.
+#       Many FTP clients do not deal with idle connection closures well,
+#       necessitating a longer default timeout than client_idle_pconn_timeout
+#       used for incoming HTTP requests.
+#Default:
+# ftp_client_idle_timeout 30 minutes
+
+#  TAG: client_lifetime time-units
+#       The maximum amount of time a client (browser) is allowed to
+#       remain connected to the cache process.  This protects the Cache
+#       from having a lot of sockets (and hence file descriptors) tied up
+#       in a CLOSE_WAIT state from remote clients that go away without
+#       properly shutting down (either because of a network failure or
+#       because of a poor client implementation).  The default is one
+#       day, 1440 minutes.
+#
+#       NOTE:  The default value is intended to be much larger than any
+#       client would ever need to be connected to your cache.  You
+#       should probably change client_lifetime only as a last resort.
+#       If you seem to have many client connections tying up
+#       filedescriptors, we recommend first tuning the read_timeout,
+#       request_timeout, persistent_request_timeout and quick_abort values.
+#Default:
+# client_lifetime 1 day
+
+#  TAG: half_closed_clients
+#       Some clients may shutdown the sending side of their TCP
+#       connections, while leaving their receiving sides open.  Sometimes,
+#       Squid can not tell the difference between a half-closed and a
+#       fully-closed TCP connection.
+#
+#       By default, Squid will immediately close client connections when
+#       read(2) returns "no more data to read."
+#
+#       Change this option to 'on' and Squid will keep open connections
+#       until a read(2) or write(2) on the socket returns an error.
+#       This may show some benefits for reverse proxies. But if not
+#       it is recommended to leave OFF.
+#Default:
+# half_closed_clients off
+
+#  TAG: server_idle_pconn_timeout
+#       Timeout for idle persistent connections to servers and other
+#       proxies.
+#Default:
+# server_idle_pconn_timeout 1 minute
+
+#  TAG: ident_timeout
+#       Maximum time to wait for IDENT lookups to complete.
+#
+#       If this is too high, and you enabled IDENT lookups from untrusted
+#       users, you might be susceptible to denial-of-service by having
+#       many ident requests going at once.
+#Default:
+# ident_timeout 10 seconds
+
+#  TAG: shutdown_lifetime       time-units
+#       When SIGTERM or SIGHUP is received, the cache is put into
+#       "shutdown pending" mode until all active sockets are closed.
+#       This value is the lifetime to set for all open descriptors
+#       during shutdown mode.  Any active clients after this many
+#       seconds will receive a 'timeout' message.
+#Default:
+# shutdown_lifetime 30 seconds
+
+# ADMINISTRATIVE PARAMETERS
+# -----------------------------------------------------------------------------
+
+#  TAG: cache_mgr
+#       Email-address of local cache manager who will receive
+#       mail if the cache dies.  The default is "webmaster".
+#Default:
+# cache_mgr webmaster
+
+#  TAG: mail_from
+#       From: email-address for mail sent when the cache dies.
+#       The default is to use 'squid@unique_hostname'.
+#
+#       See also: unique_hostname directive.
+#Default:
+# none
+
+#  TAG: mail_program
+#       Email program used to send mail if the cache dies.
+#       The default is "mail". The specified program must comply
+#       with the standard Unix mail syntax:
+#         mail-program recipient < mailfile
+#
+#       Optional command line options can be specified.
+#Default:
+# mail_program mail
+
+#  TAG: cache_effective_user
+#       If you start Squid as root, it will change its effective/real
+#       UID/GID to the user specified below.  The default is to change
+#       to UID of proxy.
+#       see also; cache_effective_group
+#Default:
+# cache_effective_user proxy
+
+#  TAG: cache_effective_group
+#       Squid sets the GID to the effective user's default group ID
+#       (taken from the password file) and supplementary group list
+#       from the groups membership.
+#
+#       If you want Squid to run with a specific GID regardless of
+#       the group memberships of the effective user then set this
+#       to the group (or GID) you want Squid to run as. When set
+#       all other group privileges of the effective user are ignored
+#       and only this GID is effective. If Squid is not started as
+#       root the user starting Squid MUST be member of the specified
+#       group.
+#
+#       This option is not recommended by the Squid Team.
+#       Our preference is for administrators to configure a secure
+#       user account for squid with UID/GID matching system policies.
+#Default:
+# Use system group memberships of the cache_effective_user account
+
+#  TAG: httpd_suppress_version_string   on|off
+#       Suppress Squid version string info in HTTP headers and HTML error pages.
+#Default:
+# httpd_suppress_version_string off
+
+#  TAG: visible_hostname
+#       If you want to present a special hostname in error messages, etc,
+#       define this.  Otherwise, the return value of gethostname()
+#       will be used. If you have multiple caches in a cluster and
+#       get errors about IP-forwarding you must set them to have individual
+#       names with this setting.
+#Default:
+# Automatically detect the system host name
+
+#  TAG: unique_hostname
+#       If you want to have multiple machines with the same
+#       'visible_hostname' you must give each machine a different
+#       'unique_hostname' so forwarding loops can be detected.
+#Default:
+# Copy the value from visible_hostname
+
+#  TAG: hostname_aliases
+#       A list of other DNS names your cache has.
+#Default:
+# none
+
+#  TAG: umask
+#       Minimum umask which should be enforced while the proxy
+#       is running, in addition to the umask set at startup.
+#
+#       For a traditional octal representation of umasks, start
+#        your value with 0.
+#Default:
+# umask 027
+
+# OPTIONS FOR THE CACHE REGISTRATION SERVICE
+# -----------------------------------------------------------------------------
+#
+#       This section contains parameters for the (optional) cache
+#       announcement service.  This service is provided to help
+#       cache administrators locate one another in order to join or
+#       create cache hierarchies.
+#
+#       An 'announcement' message is sent (via UDP) to the registration
+#       service by Squid.  By default, the announcement message is NOT
+#       SENT unless you enable it with 'announce_period' below.
+#
+#       The announcement message includes your hostname, plus the
+#       following information from this configuration file:
+#
+#               http_port
+#               icp_port
+#               cache_mgr
+#
+#       All current information is processed regularly and made
+#       available on the Web at http://www.ircache.net/Cache/Tracker/.
+
+#  TAG: announce_period
+#       This is how frequently to send cache announcements.
+#
+#       To enable announcing your cache, just set an announce period.
+#
+#       Example:
+#               announce_period 1 day
+#Default:
+# Announcement messages disabled.
+
+#  TAG: announce_host
+#       Set the hostname where announce registration messages will be sent.
+#
+#       See also announce_port and announce_file
+#Default:
+# announce_host tracker.ircache.net
+
+#  TAG: announce_file
+#       The contents of this file will be included in the announce
+#       registration messages.
+#Default:
+# none
+
+#  TAG: announce_port
+#       Set the port where announce registration messages will be sent.
+#
+#       See also announce_host and announce_file
+#Default:
+# announce_port 3131
+
+# HTTPD-ACCELERATOR OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: httpd_accel_surrogate_id
+#       Surrogates (http://www.esi.org/architecture_spec_1.0.html)
+#       need an identification token to allow control targeting. Because
+#       a farm of surrogates may all perform the same tasks, they may share
+#       an identification token.
+#Default:
+# visible_hostname is used if no specific ID is set.
+
+#  TAG: http_accel_surrogate_remote     on|off
+#       Remote surrogates (such as those in a CDN) honour the header
+#       "Surrogate-Control: no-store-remote".
+#
+#       Set this to on to have squid behave as a remote surrogate.
+#Default:
+# http_accel_surrogate_remote off
+
+#  TAG: esi_parser      libxml2|expat|custom
+#       ESI markup is not strictly XML compatible. The custom ESI parser
+#       will give higher performance, but cannot handle non ASCII character
+#       encodings.
+#Default:
+# esi_parser custom
+
+# DELAY POOL PARAMETERS
+# -----------------------------------------------------------------------------
+
+#  TAG: delay_pools
+#       This represents the number of delay pools to be used.  For example,
+#       if you have one class 2 delay pool and one class 3 delays pool, you
+#       have a total of 2 delay pools.
+#
+#       See also delay_parameters, delay_class, delay_access for pool
+#       configuration details.
+#Default:
+# delay_pools 0
+
+#  TAG: delay_class
+#       This defines the class of each delay pool.  There must be exactly one
+#       delay_class line for each delay pool.  For example, to define two
+#       delay pools, one of class 2 and one of class 3, the settings above
+#       and here would be:
+#
+#       Example:
+#           delay_pools 4      # 4 delay pools
+#           delay_class 1 2    # pool 1 is a class 2 pool
+#           delay_class 2 3    # pool 2 is a class 3 pool
+#           delay_class 3 4    # pool 3 is a class 4 pool
+#           delay_class 4 5    # pool 4 is a class 5 pool
+#
+#       The delay pool classes are:
+#
+#               class 1         Everything is limited by a single aggregate
+#                               bucket.
+#
+#               class 2         Everything is limited by a single aggregate
+#                               bucket as well as an "individual" bucket chosen
+#                               from bits 25 through 32 of the IPv4 address.
+#
+#               class 3         Everything is limited by a single aggregate
+#                               bucket as well as a "network" bucket chosen
+#                               from bits 17 through 24 of the IP address and a
+#                               "individual" bucket chosen from bits 17 through
+#                               32 of the IPv4 address.
+#
+#               class 4         Everything in a class 3 delay pool, with an
+#                               additional limit on a per user basis. This
+#                               only takes effect if the username is established
+#                               in advance - by forcing authentication in your
+#                               http_access rules.
+#
+#               class 5         Requests are grouped according their tag (see
+#                               external_acl's tag= reply).
+#
+#
+#       Each pool also requires a delay_parameters directive to configure the pool size
+#       and speed limits used whenever the pool is applied to a request. Along with
+#       a set of delay_access directives to determine when it is used.
+#
+#       NOTE: If an IP address is a.b.c.d
+#               -> bits 25 through 32 are "d"
+#               -> bits 17 through 24 are "c"
+#               -> bits 17 through 32 are "c * 256 + d"
+#
+#       NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to
+#               IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic.
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#       See also delay_parameters and delay_access.
+#Default:
+# none
+
+#  TAG: delay_access
+#       This is used to determine which delay pool a request falls into.
+#
+#       delay_access is sorted per pool and the matching starts with pool 1,
+#       then pool 2, ..., and finally pool N. The first delay pool where the
+#       request is allowed is selected for the request. If it does not allow
+#       the request to any pool then the request is not delayed (default).
+#
+#       For example, if you want some_big_clients in delay
+#       pool 1 and lotsa_little_clients in delay pool 2:
+#
+#               delay_access 1 allow some_big_clients
+#               delay_access 1 deny all
+#               delay_access 2 allow lotsa_little_clients
+#               delay_access 2 deny all
+#               delay_access 3 allow authenticated_clients
+#
+#       See also delay_parameters and delay_class.
+#
+#Default:
+# Deny using the pool, unless allow rules exist in squid.conf for the pool.
+
+#  TAG: delay_parameters
+#       This defines the parameters for a delay pool.  Each delay pool has
+#       a number of "buckets" associated with it, as explained in the
+#       description of delay_class.
+#
+#       For a class 1 delay pool, the syntax is:
+#               delay_class pool 1
+#               delay_parameters pool aggregate
+#
+#       For a class 2 delay pool:
+#               delay_class pool 2
+#               delay_parameters pool aggregate individual
+#
+#       For a class 3 delay pool:
+#               delay_class pool 3
+#               delay_parameters pool aggregate network individual
+#
+#       For a class 4 delay pool:
+#               delay_class pool 4
+#               delay_parameters pool aggregate network individual user
+#
+#       For a class 5 delay pool:
+#               delay_class pool 5
+#               delay_parameters pool tagrate
+#
+#       The option variables are:
+#
+#               pool            a pool number - ie, a number between 1 and the
+#                               number specified in delay_pools as used in
+#                               delay_class lines.
+#
+#               aggregate       the speed limit parameters for the aggregate bucket
+#                               (class 1, 2, 3).
+#
+#               individual      the speed limit parameters for the individual
+#                               buckets (class 2, 3).
+#
+#               network         the speed limit parameters for the network buckets
+#                               (class 3).
+#
+#               user            the speed limit parameters for the user buckets
+#                               (class 4).
+#
+#               tagrate         the speed limit parameters for the tag buckets
+#                               (class 5).
+#
+#       A pair of delay parameters is written restore/maximum, where restore is
+#       the number of bytes (not bits - modem and network speeds are usually
+#       quoted in bits) per second placed into the bucket, and maximum is the
+#       maximum number of bytes which can be in the bucket at any time.
+#
+#       There must be one delay_parameters line for each delay pool.
+#
+#
+#       For example, if delay pool number 1 is a class 2 delay pool as in the
+#       above example, and is being used to strictly limit each host to 64Kbit/sec
+#       (plus overheads), with no overall limit, the line is:
+#
+#               delay_parameters 1 none 8000/8000
+#
+#       Note that 8 x 8K Byte/sec -> 64K bit/sec.
+#
+#       Note that the word 'none' is used to represent no limit.
+#
+#
+#       And, if delay pool number 2 is a class 3 delay pool as in the above
+#       example, and you want to limit it to a total of 256Kbit/sec (strict limit)
+#       with each 8-bit network permitted 64Kbit/sec (strict limit) and each
+#       individual host permitted 4800bit/sec with a bucket maximum size of 64Kbits
+#       to permit a decent web page to be downloaded at a decent speed
+#       (if the network is not being limited due to overuse) but slow down
+#       large downloads more significantly:
+#
+#               delay_parameters 2 32000/32000 8000/8000 600/8000
+#
+#       Note that 8 x  32K Byte/sec ->  256K bit/sec.
+#                 8 x   8K Byte/sec ->   64K bit/sec.
+#                 8 x 600  Byte/sec -> 4800  bit/sec.
+#
+#
+#       Finally, for a class 4 delay pool as in the example - each user will
+#       be limited to 128Kbits/sec no matter how many workstations they are logged into.:
+#
+#               delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000
+#
+#
+#       See also delay_class and delay_access.
+#
+#Default:
+# none
+
+#  TAG: delay_initial_bucket_level      (percent, 0-100)
+#       The initial bucket percentage is used to determine how much is put
+#       in each bucket when squid starts, is reconfigured, or first notices
+#       a host accessing it (in class 2 and class 3, individual hosts and
+#       networks only have buckets associated with them once they have been
+#       "seen" by squid).
+#Default:
+# delay_initial_bucket_level 50
+
+# CLIENT DELAY POOL PARAMETERS
+# -----------------------------------------------------------------------------
+
+#  TAG: client_delay_pools
+#       This option specifies the number of client delay pools used. It must
+#       preceed other client_delay_* options.
+#
+#       Example:
+#               client_delay_pools 2
+#
+#       See also client_delay_parameters and client_delay_access.
+#Default:
+# client_delay_pools 0
+
+#  TAG: client_delay_initial_bucket_level       (percent, 0-no_limit)
+#       This option determines the initial bucket size as a percentage of
+#       max_bucket_size from client_delay_parameters. Buckets are created
+#       at the time of the "first" connection from the matching IP. Idle
+#       buckets are periodically deleted up.
+#
+#       You can specify more than 100 percent but note that such "oversized"
+#       buckets are not refilled until their size goes down to max_bucket_size
+#       from client_delay_parameters.
+#
+#       Example:
+#               client_delay_initial_bucket_level 50
+#Default:
+# client_delay_initial_bucket_level 50
+
+#  TAG: client_delay_parameters
+#
+#       This option configures client-side bandwidth limits using the
+#       following format:
+#
+#           client_delay_parameters pool speed_limit max_bucket_size
+#
+#       pool is an integer ID used for client_delay_access matching.
+#
+#       speed_limit is bytes added to the bucket per second.
+#
+#       max_bucket_size is the maximum size of a bucket, enforced after any
+#       speed_limit additions.
+#
+#       Please see the delay_parameters option for more information and
+#       examples.
+#
+#       Example:
+#               client_delay_parameters 1 1024 2048
+#               client_delay_parameters 2 51200 16384
+#
+#       See also client_delay_access.
+#
+#Default:
+# none
+
+#  TAG: client_delay_access
+#       This option determines the client-side delay pool for the
+#       request:
+#
+#           client_delay_access pool_ID allow|deny acl_name
+#
+#       All client_delay_access options are checked in their pool ID
+#       order, starting with pool 1. The first checked pool with allowed
+#       request is selected for the request. If no ACL matches or there
+#       are no client_delay_access options, the request bandwidth is not
+#       limited.
+#
+#       The ACL-selected pool is then used to find the
+#       client_delay_parameters for the request. Client-side pools are
+#       not used to aggregate clients. Clients are always aggregated
+#       based on their source IP addresses (one bucket per source IP).
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#       Additionally, only the client TCP connection details are available.
+#       ACLs testing HTTP properties will not work.
+#
+#       Please see delay_access for more examples.
+#
+#       Example:
+#               client_delay_access 1 allow low_rate_network
+#               client_delay_access 2 allow vips_network
+#
+#
+#       See also client_delay_parameters and client_delay_pools.
+#Default:
+# Deny use of the pool, unless allow rules exist in squid.conf for the pool.
+
+# WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: wccp_router
+#       Use this option to define your WCCP ``home'' router for
+#       Squid.
+#
+#       wccp_router supports a single WCCP(v1) router
+#
+#       wccp2_router supports multiple WCCPv2 routers
+#
+#       only one of the two may be used at the same time and defines
+#       which version of WCCP to use.
+#Default:
+# WCCP disabled.
+
+#  TAG: wccp2_router
+#       Use this option to define your WCCP ``home'' router for
+#       Squid.
+#
+#       wccp_router supports a single WCCP(v1) router
+#
+#       wccp2_router supports multiple WCCPv2 routers
+#
+#       only one of the two may be used at the same time and defines
+#       which version of WCCP to use.
+#Default:
+# WCCPv2 disabled.
+
+#  TAG: wccp_version
+#       This directive is only relevant if you need to set up WCCP(v1)
+#       to some very old and end-of-life Cisco routers. In all other
+#       setups it must be left unset or at the default setting.
+#       It defines an internal version in the WCCP(v1) protocol,
+#       with version 4 being the officially documented protocol.
+#
+#       According to some users, Cisco IOS 11.2 and earlier only
+#       support WCCP version 3.  If you're using that or an earlier
+#       version of IOS, you may need to change this value to 3, otherwise
+#       do not specify this parameter.
+#Default:
+# wccp_version 4
+
+#  TAG: wccp2_rebuild_wait
+#       If this is enabled Squid will wait for the cache dir rebuild to finish
+#       before sending the first wccp2 HereIAm packet
+#Default:
+# wccp2_rebuild_wait on
+
+#  TAG: wccp2_forwarding_method
+#       WCCP2 allows the setting of forwarding methods between the
+#       router/switch and the cache.  Valid values are as follows:
+#
+#       gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
+#       l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)
+#
+#       Currently (as of IOS 12.4) cisco routers only support GRE.
+#       Cisco switches only support the L2 redirect assignment method.
+#Default:
+# wccp2_forwarding_method gre
+
+#  TAG: wccp2_return_method
+#       WCCP2 allows the setting of return methods between the
+#       router/switch and the cache for packets that the cache
+#       decides not to handle.  Valid values are as follows:
+#
+#       gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
+#       l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)
+#
+#       Currently (as of IOS 12.4) cisco routers only support GRE.
+#       Cisco switches only support the L2 redirect assignment.
+#
+#       If the "ip wccp redirect exclude in" command has been
+#       enabled on the cache interface, then it is still safe for
+#       the proxy server to use a l2 redirect method even if this
+#       option is set to GRE.
+#Default:
+# wccp2_return_method gre
+
+#  TAG: wccp2_assignment_method
+#       WCCP2 allows the setting of methods to assign the WCCP hash
+#       Valid values are as follows:
+#
+#       hash - Hash assignment
+#       mask - Mask assignment
+#
+#       As a general rule, cisco routers support the hash assignment method
+#       and cisco switches support the mask assignment method.
+#Default:
+# wccp2_assignment_method hash
+
+#  TAG: wccp2_service
+#       WCCP2 allows for multiple traffic services. There are two
+#       types: "standard" and "dynamic". The standard type defines
+#       one service id - http (id 0). The dynamic service ids can be from
+#       51 to 255 inclusive.  In order to use a dynamic service id
+#       one must define the type of traffic to be redirected; this is done
+#       using the wccp2_service_info option.
+#
+#       The "standard" type does not require a wccp2_service_info option,
+#       just specifying the service id will suffice.
+#
+#       MD5 service authentication can be enabled by adding
+#       "password=<password>" to the end of this service declaration.
+#
+#       Examples:
+#
+#       wccp2_service standard 0        # for the 'web-cache' standard service
+#       wccp2_service dynamic 80        # a dynamic service type which will be
+#                                       # fleshed out with subsequent options.
+#       wccp2_service standard 0 password=foo
+#Default:
+# Use the 'web-cache' standard service.
+
+#  TAG: wccp2_service_info
+#       Dynamic WCCPv2 services require further information to define the
+#       traffic you wish to have diverted.
+#
+#       The format is:
+#
+#       wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>..
+#           priority=<priority> ports=<port>,<port>..
+#
+#       The relevant WCCPv2 flags:
+#       + src_ip_hash, dst_ip_hash
+#       + source_port_hash, dst_port_hash
+#       + src_ip_alt_hash, dst_ip_alt_hash
+#       + src_port_alt_hash, dst_port_alt_hash
+#       + ports_source
+#
+#       The port list can be one to eight entries.
+#
+#       Example:
+#
+#       wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source
+#           priority=240 ports=80
+#
+#       Note: the service id must have been defined by a previous
+#       'wccp2_service dynamic <id>' entry.
+#Default:
+# none
+
+#  TAG: wccp2_weight
+#       Each cache server gets assigned a set of the destination
+#       hash proportional to their weight.
+#Default:
+# wccp2_weight 10000
+
+#  TAG: wccp_address
+#       Use this option if you require WCCPv2 to use a specific
+#       interface address.
+#
+#       The default behavior is to not bind to any specific address.
+#Default:
+# Address selected by the operating system.
+
+#  TAG: wccp2_address
+#       Use this option if you require WCCP to use a specific
+#       interface address.
+#
+#       The default behavior is to not bind to any specific address.
+#Default:
+# Address selected by the operating system.
+
+# PERSISTENT CONNECTION HANDLING
+# -----------------------------------------------------------------------------
+#
+# Also see "pconn_timeout" in the TIMEOUTS section
+
+#  TAG: client_persistent_connections
+#       Persistent connection support for clients.
+#       Squid uses persistent connections (when allowed). You can use
+#       this option to disable persistent connections with clients.
+#Default:
+# client_persistent_connections on
+
+#  TAG: server_persistent_connections
+#       Persistent connection support for servers.
+#       Squid uses persistent connections (when allowed). You can use
+#       this option to disable persistent connections with servers.
+#Default:
+# server_persistent_connections on
+
+#  TAG: persistent_connection_after_error
+#       With this directive the use of persistent connections after
+#       HTTP errors can be disabled. Useful if you have clients
+#       who fail to handle errors on persistent connections proper.
+#Default:
+# persistent_connection_after_error on
+
+#  TAG: detect_broken_pconn
+#       Some servers have been found to incorrectly signal the use
+#       of HTTP/1.0 persistent connections even on replies not
+#       compatible, causing significant delays. This server problem
+#       has mostly been seen on redirects.
+#
+#       By enabling this directive Squid attempts to detect such
+#       broken replies and automatically assume the reply is finished
+#       after 10 seconds timeout.
+#Default:
+# detect_broken_pconn off
+
+# CACHE DIGEST OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: digest_generation
+#       This controls whether the server will generate a Cache Digest
+#       of its contents.  By default, Cache Digest generation is
+#       enabled if Squid is compiled with --enable-cache-digests defined.
+#Default:
+# digest_generation on
+
+#  TAG: digest_bits_per_entry
+#       This is the number of bits of the server's Cache Digest which
+#       will be associated with the Digest entry for a given HTTP
+#       Method and URL (public key) combination.  The default is 5.
+#Default:
+# digest_bits_per_entry 5
+
+#  TAG: digest_rebuild_period   (seconds)
+#       This is the wait time between Cache Digest rebuilds.
+#Default:
+# digest_rebuild_period 1 hour
+
+#  TAG: digest_rewrite_period   (seconds)
+#       This is the wait time between Cache Digest writes to
+#       disk.
+#Default:
+# digest_rewrite_period 1 hour
+
+#  TAG: digest_swapout_chunk_size       (bytes)
+#       This is the number of bytes of the Cache Digest to write to
+#       disk at a time.  It defaults to 4096 bytes (4KB), the Squid
+#       default swap page.
+#Default:
+# digest_swapout_chunk_size 4096 bytes
+
+#  TAG: digest_rebuild_chunk_percentage (percent, 0-100)
+#       This is the percentage of the Cache Digest to be scanned at a
+#       time.  By default it is set to 10% of the Cache Digest.
+#Default:
+# digest_rebuild_chunk_percentage 10
+
+# SNMP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: snmp_port
+#       The port number where Squid listens for SNMP requests. To enable
+#       SNMP support set this to a suitable port number. Port number
+#       3401 is often used for the Squid SNMP agent. By default it's
+#       set to "0" (disabled)
+#
+#       Example:
+#               snmp_port 3401
+#Default:
+# SNMP disabled.
+
+#  TAG: snmp_access
+#       Allowing or denying access to the SNMP port.
+#
+#       All access to the agent is denied by default.
+#       usage:
+#
+#       snmp_access allow|deny [!]aclname ...
+#
+#       This clause only supports fast acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#
+#Example:
+# snmp_access allow snmppublic localhost
+# snmp_access deny all
+#Default:
+# Deny, unless rules exist in squid.conf.
+
+#  TAG: snmp_incoming_address
+#       Just like 'udp_incoming_address', but for the SNMP port.
+#
+#       snmp_incoming_address   is used for the SNMP socket receiving
+#                               messages from SNMP agents.
+#
+#       The default snmp_incoming_address is to listen on all
+#       available network interfaces.
+#Default:
+# Accept SNMP packets from all machine interfaces.
+
+#  TAG: snmp_outgoing_address
+#       Just like 'udp_outgoing_address', but for the SNMP port.
+#
+#       snmp_outgoing_address   is used for SNMP packets returned to SNMP
+#                               agents.
+#
+#       If snmp_outgoing_address is not set it will use the same socket
+#       as snmp_incoming_address. Only change this if you want to have
+#       SNMP replies sent using another address than where this Squid
+#       listens for SNMP queries.
+#
+#       NOTE, snmp_incoming_address and snmp_outgoing_address can not have
+#       the same value since they both use the same port.
+#Default:
+# Use snmp_incoming_address or an address selected by the operating system.
+
+# ICP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: icp_port
+#       The port number where Squid sends and receives ICP queries to
+#       and from neighbor caches.  The standard UDP port for ICP is 3130.
+#
+#       Example:
+#               icp_port 3130
+#Default:
+# ICP disabled.
+
+#  TAG: htcp_port
+#       The port number where Squid sends and receives HTCP queries to
+#       and from neighbor caches.  To turn it on you want to set it to
+#       4827.
+#
+#       Example:
+#               htcp_port 4827
+#Default:
+# HTCP disabled.
+
+#  TAG: log_icp_queries on|off
+#       If set, ICP queries are logged to access.log. You may wish
+#       do disable this if your ICP load is VERY high to speed things
+#       up or to simplify log analysis.
+#Default:
+# log_icp_queries on
+
+#  TAG: udp_incoming_address
+#       udp_incoming_address    is used for UDP packets received from other
+#                               caches.
+#
+#       The default behavior is to not bind to any specific address.
+#
+#       Only change this if you want to have all UDP queries received on
+#       a specific interface/address.
+#
+#       NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS
+#       modules. Altering it will affect all of them in the same manner.
+#
+#       see also; udp_outgoing_address
+#
+#       NOTE, udp_incoming_address and udp_outgoing_address can not
+#       have the same value since they both use the same port.
+#Default:
+# Accept packets from all machine interfaces.
+
+#  TAG: udp_outgoing_address
+#       udp_outgoing_address    is used for UDP packets sent out to other
+#                               caches.
+#
+#       The default behavior is to not bind to any specific address.
+#
+#       Instead it will use the same socket as udp_incoming_address.
+#       Only change this if you want to have UDP queries sent using another
+#       address than where this Squid listens for UDP queries from other
+#       caches.
+#
+#       NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS
+#       modules. Altering it will affect all of them in the same manner.
+#
+#       see also; udp_incoming_address
+#
+#       NOTE, udp_incoming_address and udp_outgoing_address can not
+#       have the same value since they both use the same port.
+#Default:
+# Use udp_incoming_address or an address selected by the operating system.
+
+#  TAG: icp_hit_stale   on|off
+#       If you want to return ICP_HIT for stale cache objects, set this
+#       option to 'on'.  If you have sibling relationships with caches
+#       in other administrative domains, this should be 'off'.  If you only
+#       have sibling relationships with caches under your control,
+#       it is probably okay to set this to 'on'.
+#       If set to 'on', your siblings should use the option "allow-miss"
+#       on their cache_peer lines for connecting to you.
+#Default:
+# icp_hit_stale off
+
+#  TAG: minimum_direct_hops
+#       If using the ICMP pinging stuff, do direct fetches for sites
+#       which are no more than this many hops away.
+#Default:
+# minimum_direct_hops 4
+
+#  TAG: minimum_direct_rtt      (msec)
+#       If using the ICMP pinging stuff, do direct fetches for sites
+#       which are no more than this many rtt milliseconds away.
+#Default:
+# minimum_direct_rtt 400
+
+#  TAG: netdb_low
+#       The low water mark for the ICMP measurement database.
+#
+#       Note: high watermark controlled by netdb_high directive.
+#
+#       These watermarks are counts, not percents.  The defaults are
+#       (low) 900 and (high) 1000.  When the high water mark is
+#       reached, database entries will be deleted until the low
+#       mark is reached.
+#Default:
+# netdb_low 900
+
+#  TAG: netdb_high
+#       The high water mark for the ICMP measurement database.
+#
+#       Note: low watermark controlled by netdb_low directive.
+#
+#       These watermarks are counts, not percents.  The defaults are
+#       (low) 900 and (high) 1000.  When the high water mark is
+#       reached, database entries will be deleted until the low
+#       mark is reached.
+#Default:
+# netdb_high 1000
+
+#  TAG: netdb_ping_period
+#       The minimum period for measuring a site.  There will be at
+#       least this much delay between successive pings to the same
+#       network.  The default is five minutes.
+#Default:
+# netdb_ping_period 5 minutes
+
+#  TAG: query_icmp      on|off
+#       If you want to ask your peers to include ICMP data in their ICP
+#       replies, enable this option.
+#
+#       If your peer has configured Squid (during compilation) with
+#       '--enable-icmp' that peer will send ICMP pings to origin server
+#       sites of the URLs it receives.  If you enable this option the
+#       ICP replies from that peer will include the ICMP data (if available).
+#       Then, when choosing a parent cache, Squid will choose the parent with
+#       the minimal RTT to the origin server.  When this happens, the
+#       hierarchy field of the access.log will be
+#       "CLOSEST_PARENT_MISS".  This option is off by default.
+#Default:
+# query_icmp off
+
+#  TAG: test_reachability       on|off
+#       When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH
+#       instead of ICP_MISS if the target host is NOT in the ICMP
+#       database, or has a zero RTT.
+#Default:
+# test_reachability off
+
+#  TAG: icp_query_timeout       (msec)
+#       Normally Squid will automatically determine an optimal ICP
+#       query timeout value based on the round-trip-time of recent ICP
+#       queries.  If you want to override the value determined by
+#       Squid, set this 'icp_query_timeout' to a non-zero value.  This
+#       value is specified in MILLISECONDS, so, to use a 2-second
+#       timeout (the old default), you would write:
+#
+#               icp_query_timeout 2000
+#Default:
+# Dynamic detection.
+
+#  TAG: maximum_icp_query_timeout       (msec)
+#       Normally the ICP query timeout is determined dynamically.  But
+#       sometimes it can lead to very large values (say 5 seconds).
+#       Use this option to put an upper limit on the dynamic timeout
+#       value.  Do NOT use this option to always use a fixed (instead
+#       of a dynamic) timeout value. To set a fixed timeout see the
+#       'icp_query_timeout' directive.
+#Default:
+# maximum_icp_query_timeout 2000
+
+#  TAG: minimum_icp_query_timeout       (msec)
+#       Normally the ICP query timeout is determined dynamically.  But
+#       sometimes it can lead to very small timeouts, even lower than
+#       the normal latency variance on your link due to traffic.
+#       Use this option to put an lower limit on the dynamic timeout
+#       value.  Do NOT use this option to always use a fixed (instead
+#       of a dynamic) timeout value. To set a fixed timeout see the
+#       'icp_query_timeout' directive.
+#Default:
+# minimum_icp_query_timeout 5
+
+#  TAG: background_ping_rate    time-units
+#       Controls how often the ICP pings are sent to siblings that
+#       have background-ping set.
+#Default:
+# background_ping_rate 10 seconds
+
+# MULTICAST ICP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: mcast_groups
+#       This tag specifies a list of multicast groups which your server
+#       should join to receive multicasted ICP queries.
+#
+#       NOTE!  Be very careful what you put here!  Be sure you
+#       understand the difference between an ICP _query_ and an ICP
+#       _reply_.  This option is to be set only if you want to RECEIVE
+#       multicast queries.  Do NOT set this option to SEND multicast
+#       ICP (use cache_peer for that).  ICP replies are always sent via
+#       unicast, so this option does not affect whether or not you will
+#       receive replies from multicast group members.
+#
+#       You must be very careful to NOT use a multicast address which
+#       is already in use by another group of caches.
+#
+#       If you are unsure about multicast, please read the Multicast
+#       chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/).
+#
+#       Usage: mcast_groups 239.128.16.128 224.0.1.20
+#
+#       By default, Squid doesn't listen on any multicast groups.
+#Default:
+# none
+
+#  TAG: mcast_miss_addr
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#       If you enable this option, every "cache miss" URL will
+#       be sent out on the specified multicast address.
+#
+#       Do not enable this option unless you are are absolutely
+#       certain you understand what you are doing.
+#Default:
+# disabled.
+
+#  TAG: mcast_miss_ttl
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#       This is the time-to-live value for packets multicasted
+#       when multicasting off cache miss URLs is enabled.  By
+#       default this is set to 'site scope', i.e. 16.
+#Default:
+# mcast_miss_ttl 16
+
+#  TAG: mcast_miss_port
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#       This is the port number to be used in conjunction with
+#       'mcast_miss_addr'.
+#Default:
+# mcast_miss_port 3135
+
+#  TAG: mcast_miss_encode_key
+# Note: This option is only available if Squid is rebuilt with the
+#       -DMULTICAST_MISS_STREAM define
+#
+#       The URLs that are sent in the multicast miss stream are
+#       encrypted.  This is the encryption key.
+#Default:
+# mcast_miss_encode_key XXXXXXXXXXXXXXXX
+
+#  TAG: mcast_icp_query_timeout (msec)
+#       For multicast peers, Squid regularly sends out ICP "probes" to
+#       count how many other peers are listening on the given multicast
+#       address.  This value specifies how long Squid should wait to
+#       count all the replies.  The default is 2000 msec, or 2
+#       seconds.
+#Default:
+# mcast_icp_query_timeout 2000
+
+# INTERNAL ICON OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: icon_directory
+#       Where the icons are stored. These are normally kept in
+#       /usr/share/squid/icons
+#Default:
+# icon_directory /usr/share/squid/icons
+
+#  TAG: global_internal_static
+#       This directive controls is Squid should intercept all requests for
+#       /squid-internal-static/ no matter which host the URL is requesting
+#       (default on setting), or if nothing special should be done for
+#       such URLs (off setting). The purpose of this directive is to make
+#       icons etc work better in complex cache hierarchies where it may
+#       not always be possible for all corners in the cache mesh to reach
+#       the server generating a directory listing.
+#Default:
+# global_internal_static on
+
+#  TAG: short_icon_urls
+#       If this is enabled Squid will use short URLs for icons.
+#       If disabled it will revert to the old behavior of including
+#       it's own name and port in the URL.
+#
+#       If you run a complex cache hierarchy with a mix of Squid and
+#       other proxies you may need to disable this directive.
+#Default:
+# short_icon_urls on
+
+# ERROR PAGE OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: error_directory
+#       If you wish to create your own versions of the default
+#       error files to customize them to suit your company copy
+#       the error/template files to another directory and point
+#       this tag at them.
+#
+#       WARNING: This option will disable multi-language support
+#                on error pages if used.
+#
+#       The squid developers are interested in making squid available in
+#       a wide variety of languages. If you are making translations for a
+#       language that Squid does not currently provide please consider
+#       contributing your translation back to the project.
+#       http://wiki.squid-cache.org/Translations
+#
+#       The squid developers working on translations are happy to supply drop-in
+#       translated error files in exchange for any new language contributions.
+#Default:
+# Send error pages in the clients preferred language
+
+#  TAG: error_default_language
+#       Set the default language which squid will send error pages in
+#       if no existing translation matches the clients language
+#       preferences.
+#
+#       If unset (default) generic English will be used.
+#
+#       The squid developers are interested in making squid available in
+#       a wide variety of languages. If you are interested in making
+#       translations for any language see the squid wiki for details.
+#       http://wiki.squid-cache.org/Translations
+#Default:
+# Generate English language pages.
+
+#  TAG: error_log_languages
+#       Log to cache.log what languages users are attempting to
+#       auto-negotiate for translations.
+#
+#       Successful negotiations are not logged. Only failures
+#       have meaning to indicate that Squid may need an upgrade
+#       of its error page translations.
+#Default:
+# error_log_languages on
+
+#  TAG: err_page_stylesheet
+#       CSS Stylesheet to pattern the display of Squid default error pages.
+#
+#       For information on CSS see http://www.w3.org/Style/CSS/
+#Default:
+# err_page_stylesheet /etc/squid/errorpage.css
+
+#  TAG: err_html_text
+#       HTML text to include in error messages.  Make this a "mailto"
+#       URL to your admin address, or maybe just a link to your
+#       organizations Web page.
+#
+#       To include this in your error messages, you must rewrite
+#       the error template files (found in the "errors" directory).
+#       Wherever you want the 'err_html_text' line to appear,
+#       insert a %L tag in the error template file.
+#Default:
+# none
+
+#  TAG: email_err_data  on|off
+#       If enabled, information about the occurred error will be
+#       included in the mailto links of the ERR pages (if %W is set)
+#       so that the email body contains the data.
+#       Syntax is <A HREF="mailto:%w%W">%w</A>
+#Default:
+# email_err_data on
+
+#  TAG: deny_info
+#       Usage:   deny_info err_page_name acl
+#       or       deny_info http://... acl
+#       or       deny_info TCP_RESET acl
+#
+#       This can be used to return a ERR_ page for requests which
+#       do not pass the 'http_access' rules.  Squid remembers the last
+#       acl it evaluated in http_access, and if a 'deny_info' line exists
+#       for that ACL Squid returns a corresponding error page.
+#
+#       The acl is typically the last acl on the http_access deny line which
+#       denied access. The exceptions to this rule are:
+#       - When Squid needs to request authentication credentials. It's then
+#         the first authentication related acl encountered
+#       - When none of the http_access lines matches. It's then the last
+#         acl processed on the last http_access line.
+#       - When the decision to deny access was made by an adaptation service,
+#         the acl name is the corresponding eCAP or ICAP service_name.
+#
+#       NP: If providing your own custom error pages with error_directory
+#           you may also specify them by your custom file name:
+#           Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys
+#
+#       By defaut Squid will send "403 Forbidden". A different 4xx or 5xx
+#       may be specified by prefixing the file name with the code and a colon.
+#       e.g. 404:ERR_CUSTOM_ACCESS_DENIED
+#
+#       Alternatively you can tell Squid to reset the TCP connection
+#       by specifying TCP_RESET.
+#
+#       Or you can specify an error URL or URL pattern. The browsers will
+#       get redirected to the specified URL after formatting tags have
+#       been replaced. Redirect will be done with 302 or 307 according to
+#       HTTP/1.1 specs. A different 3xx code may be specified by prefixing
+#       the URL. e.g. 303:http://example.com/
+#
+#       URL FORMAT TAGS:
+#               %a      - username (if available. Password NOT included)
+#               %B      - FTP path URL
+#               %e      - Error number
+#               %E      - Error description
+#               %h      - Squid hostname
+#               %H      - Request domain name
+#               %i      - Client IP Address
+#               %M      - Request Method
+#               %o      - Message result from external ACL helper
+#               %p      - Request Port number
+#               %P      - Request Protocol name
+#               %R      - Request URL path
+#               %T      - Timestamp in RFC 1123 format
+#               %U      - Full canonical URL from client
+#                         (HTTPS URLs terminate with *)
+#               %u      - Full canonical URL from client
+#               %w      - Admin email from squid.conf
+#               %x      - Error name
+#               %%      - Literal percent (%) code
+#
+#Default:
+# none
+
+# OPTIONS INFLUENCING REQUEST FORWARDING
+# -----------------------------------------------------------------------------
+
+#  TAG: nonhierarchical_direct
+#       By default, Squid will send any non-hierarchical requests
+#       (not cacheable request type) direct to origin servers.
+#
+#       When this is set to "off", Squid will prefer to send these
+#       requests to parents.
+#
+#       Note that in most configurations, by turning this off you will only
+#       add latency to these request without any improvement in global hit
+#       ratio.
+#
+#       This option only sets a preference. If the parent is unavailable a
+#       direct connection to the origin server may still be attempted. To
+#       completely prevent direct connections use never_direct.
+#Default:
+# nonhierarchical_direct on
+
+#  TAG: prefer_direct
+#       Normally Squid tries to use parents for most requests. If you for some
+#       reason like it to first try going direct and only use a parent if
+#       going direct fails set this to on.
+#
+#       By combining nonhierarchical_direct off and prefer_direct on you
+#       can set up Squid to use a parent as a backup path if going direct
+#       fails.
+#
+#       Note: If you want Squid to use parents for all requests see
+#       the never_direct directive. prefer_direct only modifies how Squid
+#       acts on cacheable requests.
+#Default:
+# prefer_direct off
+
+#  TAG: cache_miss_revalidate   on|off
+#       RFC 7232 defines a conditional request mechanism to prevent
+#       response objects being unnecessarily transferred over the network.
+#       If that mechanism is used by the client and a cache MISS occurs
+#       it can prevent new cache entries being created.
+#
+#       This option determines whether Squid on cache MISS will pass the
+#       client revalidation request to the server or tries to fetch new
+#       content for caching. It can be useful while the cache is mostly
+#       empty to more quickly have the cache populated by generating
+#       non-conditional GETs.
+#
+#       When set to 'on' (default), Squid will pass all client If-* headers
+#       to the server. This permits server responses without a cacheable
+#       payload to be delivered and on MISS no new cache entry is created.
+#
+#       When set to 'off' and if the request is cacheable, Squid will
+#       remove the clients If-Modified-Since and If-None-Match headers from
+#       the request sent to the server. This requests a 200 status response
+#       from the server to create a new cache entry with.
+#Default:
+# cache_miss_revalidate on
+
+#  TAG: always_direct
+#       Usage: always_direct allow|deny [!]aclname ...
+#
+#       Here you can use ACL elements to specify requests which should
+#       ALWAYS be forwarded by Squid to the origin servers without using
+#       any peers.  For example, to always directly forward requests for
+#       local servers ignoring any parents or siblings you may have use
+#       something like:
+#
+#               acl local-servers dstdomain my.domain.net
+#               always_direct allow local-servers
+#
+#       To always forward FTP requests directly, use
+#
+#               acl FTP proto FTP
+#               always_direct allow FTP
+#
+#       NOTE: There is a similar, but opposite option named
+#       'never_direct'.  You need to be aware that "always_direct deny
+#       foo" is NOT the same thing as "never_direct allow foo".  You
+#       may need to use a deny rule to exclude a more-specific case of
+#       some other rule.  Example:
+#
+#               acl local-external dstdomain external.foo.net
+#               acl local-servers dstdomain  .foo.net
+#               always_direct deny local-external
+#               always_direct allow local-servers
+#
+#       NOTE: If your goal is to make the client forward the request
+#       directly to the origin server bypassing Squid then this needs
+#       to be done in the client configuration. Squid configuration
+#       can only tell Squid how Squid should fetch the object.
+#
+#       NOTE: This directive is not related to caching. The replies
+#       is cached as usual even if you use always_direct. To not cache
+#       the replies see the 'cache' directive.
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Prevent any cache_peer being used for this request.
+
+#  TAG: never_direct
+#       Usage: never_direct allow|deny [!]aclname ...
+#
+#       never_direct is the opposite of always_direct.  Please read
+#       the description for always_direct if you have not already.
+#
+#       With 'never_direct' you can use ACL elements to specify
+#       requests which should NEVER be forwarded directly to origin
+#       servers.  For example, to force the use of a proxy for all
+#       requests, except those in your local domain use something like:
+#
+#               acl local-servers dstdomain .foo.net
+#               never_direct deny local-servers
+#               never_direct allow all
+#
+#       or if Squid is inside a firewall and there are local intranet
+#       servers inside the firewall use something like:
+#
+#               acl local-intranet dstdomain .foo.net
+#               acl local-external dstdomain external.foo.net
+#               always_direct deny local-external
+#               always_direct allow local-intranet
+#               never_direct allow all
+#
+#       This clause supports both fast and slow acl types.
+#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
+#Default:
+# Allow DNS results to be used for this request.
+
+# ADVANCED NETWORKING OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: incoming_udp_average
+#       Heavy voodoo here.  I can't even believe you are reading this.
+#       Are you crazy?  Don't even think about adjusting these unless
+#       you understand the algorithms in comm_select.c first!
+#Default:
+# incoming_udp_average 6
+
+#  TAG: incoming_tcp_average
+#       Heavy voodoo here.  I can't even believe you are reading this.
+#       Are you crazy?  Don't even think about adjusting these unless
+#       you understand the algorithms in comm_select.c first!
+#Default:
+# incoming_tcp_average 4
+
+#  TAG: incoming_dns_average
+#       Heavy voodoo here.  I can't even believe you are reading this.
+#       Are you crazy?  Don't even think about adjusting these unless
+#       you understand the algorithms in comm_select.c first!
+#Default:
+# incoming_dns_average 4
+
+#  TAG: min_udp_poll_cnt
+#       Heavy voodoo here.  I can't even believe you are reading this.
+#       Are you crazy?  Don't even think about adjusting these unless
+#       you understand the algorithms in comm_select.c first!
+#Default:
+# min_udp_poll_cnt 8
+
+#  TAG: min_dns_poll_cnt
+#       Heavy voodoo here.  I can't even believe you are reading this.
+#       Are you crazy?  Don't even think about adjusting these unless
+#       you understand the algorithms in comm_select.c first!
+#Default:
+# min_dns_poll_cnt 8
+
+#  TAG: min_tcp_poll_cnt
+#       Heavy voodoo here.  I can't even believe you are reading this.
+#       Are you crazy?  Don't even think about adjusting these unless
+#       you understand the algorithms in comm_select.c first!
+#Default:
+# min_tcp_poll_cnt 8
+
+#  TAG: accept_filter
+#       FreeBSD:
+#
+#       The name of an accept(2) filter to install on Squid's
+#       listen socket(s).  This feature is perhaps specific to
+#       FreeBSD and requires support in the kernel.
+#
+#       The 'httpready' filter delays delivering new connections
+#       to Squid until a full HTTP request has been received.
+#       See the accf_http(9) man page for details.
+#
+#       The 'dataready' filter delays delivering new connections
+#       to Squid until there is some data to process.
+#       See the accf_dataready(9) man page for details.
+#
+#       Linux:
+#
+#       The 'data' filter delays delivering of new connections
+#       to Squid until there is some data to process by TCP_ACCEPT_DEFER.
+#       You may optionally specify a number of seconds to wait by
+#       'data=N' where N is the number of seconds. Defaults to 30
+#       if not specified.  See the tcp(7) man page for details.
+#EXAMPLE:
+## FreeBSD
+#accept_filter httpready
+## Linux
+#accept_filter data
+#Default:
+# none
+
+#  TAG: client_ip_max_connections
+#       Set an absolute limit on the number of connections a single
+#       client IP can use. Any more than this and Squid will begin to drop
+#       new connections from the client until it closes some links.
+#
+#       Note that this is a global limit. It affects all HTTP, HTCP, Gopher and FTP
+#       connections from the client. For finer control use the ACL access controls.
+#
+#       Requires client_db to be enabled (the default).
+#
+#       WARNING: This may noticably slow down traffic received via external proxies
+#       or NAT devices and cause them to rebound error messages back to their clients.
+#Default:
+# No limit.
+
+#  TAG: tcp_recv_bufsize        (bytes)
+#       Size of receive buffer to set for TCP sockets.  Probably just
+#       as easy to change your kernel's default.
+#       Omit from squid.conf to use the default buffer size.
+#Default:
+# Use operating system TCP defaults.
+
+# ICAP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: icap_enable     on|off
+#       If you want to enable the ICAP module support, set this to on.
+#Default:
+# icap_enable off
+
+#  TAG: icap_connect_timeout
+#       This parameter specifies how long to wait for the TCP connect to
+#       the requested ICAP server to complete before giving up and either
+#       terminating the HTTP transaction or bypassing the failure.
+#
+#       The default for optional services is peer_connect_timeout.
+#       The default for essential services is connect_timeout.
+#       If this option is explicitly set, its value applies to all services.
+#Default:
+# none
+
+#  TAG: icap_io_timeout time-units
+#       This parameter specifies how long to wait for an I/O activity on
+#       an established, active ICAP connection before giving up and
+#       either terminating the HTTP transaction or bypassing the
+#       failure.
+#Default:
+# Use read_timeout.
+
+#  TAG: icap_service_failure_limit      limit [in memory-depth time-units]
+#       The limit specifies the number of failures that Squid tolerates
+#       when establishing a new TCP connection with an ICAP service. If
+#       the number of failures exceeds the limit, the ICAP service is
+#       not used for new ICAP requests until it is time to refresh its
+#       OPTIONS.
+#
+#       A negative value disables the limit. Without the limit, an ICAP
+#       service will not be considered down due to connectivity failures
+#       between ICAP OPTIONS requests.
+#
+#       Squid forgets ICAP service failures older than the specified
+#       value of memory-depth. The memory fading algorithm
+#       is approximate because Squid does not remember individual
+#       errors but groups them instead, splitting the option
+#       value into ten time slots of equal length.
+#
+#       When memory-depth is 0 and by default this option has no
+#       effect on service failure expiration.
+#
+#       Squid always forgets failures when updating service settings
+#       using an ICAP OPTIONS transaction, regardless of this option
+#       setting.
+#
+#       For example,
+#               # suspend service usage after 10 failures in 5 seconds:
+#               icap_service_failure_limit 10 in 5 seconds
+#Default:
+# icap_service_failure_limit 10
+
+#  TAG: icap_service_revival_delay
+#       The delay specifies the number of seconds to wait after an ICAP
+#       OPTIONS request failure before requesting the options again. The
+#       failed ICAP service is considered "down" until fresh OPTIONS are
+#       fetched.
+#
+#       The actual delay cannot be smaller than the hardcoded minimum
+#       delay of 30 seconds.
+#Default:
+# icap_service_revival_delay 180
+
+#  TAG: icap_preview_enable     on|off
+#       The ICAP Preview feature allows the ICAP server to handle the
+#       HTTP message by looking only at the beginning of the message body
+#       or even without receiving the body at all. In some environments,
+#       previews greatly speedup ICAP processing.
+#
+#       During an ICAP OPTIONS transaction, the server may tell Squid what
+#       HTTP messages should be previewed and how big the preview should be.
+#       Squid will not use Preview if the server did not request one.
+#
+#       To disable ICAP Preview for all ICAP services, regardless of
+#       individual ICAP server OPTIONS responses, set this option to "off".
+#Example:
+#icap_preview_enable off
+#Default:
+# icap_preview_enable on
+
+#  TAG: icap_preview_size
+#       The default size of preview data to be sent to the ICAP server.
+#       This value might be overwritten on a per server basis by OPTIONS requests.
+#Default:
+# No preview sent.
+
+#  TAG: icap_206_enable on|off
+#       206 (Partial Content) responses is an ICAP extension that allows the
+#       ICAP agents to optionally combine adapted and original HTTP message
+#       content. The decision to combine is postponed until the end of the
+#       ICAP response. Squid supports Partial Content extension by default.
+#
+#       Activation of the Partial Content extension is negotiated with each
+#       ICAP service during OPTIONS exchange. Most ICAP servers should handle
+#       negotation correctly even if they do not support the extension, but
+#       some might fail. To disable Partial Content support for all ICAP
+#       services and to avoid any negotiation, set this option to "off".
+#
+#       Example:
+#           icap_206_enable off
+#Default:
+# icap_206_enable on
+
+#  TAG: icap_default_options_ttl
+#       The default TTL value for ICAP OPTIONS responses that don't have
+#       an Options-TTL header.
+#Default:
+# icap_default_options_ttl 60
+
+#  TAG: icap_persistent_connections     on|off
+#       Whether or not Squid should use persistent connections to
+#       an ICAP server.
+#Default:
+# icap_persistent_connections on
+
+#  TAG: adaptation_send_client_ip       on|off
+#       If enabled, Squid shares HTTP client IP information with adaptation
+#       services. For ICAP, Squid adds the X-Client-IP header to ICAP requests.
+#       For eCAP, Squid sets the libecap::metaClientIp transaction option.
+#
+#       See also: adaptation_uses_indirect_client
+#Default:
+# adaptation_send_client_ip off
+
+#  TAG: adaptation_send_username        on|off
+#       This sends authenticated HTTP client username (if available) to
+#       the adaptation service.
+#
+#       For ICAP, the username value is encoded based on the
+#       icap_client_username_encode option and is sent using the header
+#       specified by the icap_client_username_header option.
+#Default:
+# adaptation_send_username off
+
+#  TAG: icap_client_username_header
+#       ICAP request header name to use for adaptation_send_username.
+#Default:
+# icap_client_username_header X-Client-Username
+
+#  TAG: icap_client_username_encode     on|off
+#       Whether to base64 encode the authenticated client username.
+#Default:
+# icap_client_username_encode off
+
+#  TAG: icap_service
+#       Defines a single ICAP service using the following format:
+#
+#       icap_service id vectoring_point uri [option ...]
+#
+#       id: ID
+#               an opaque identifier or name which is used to direct traffic to
+#               this specific service. Must be unique among all adaptation
+#               services in squid.conf.
+#
+#       vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
+#               This specifies at which point of transaction processing the
+#               ICAP service should be activated. *_postcache vectoring points
+#               are not yet supported.
+#
+#       uri: icap://servername:port/servicepath
+#               ICAP server and service location.
+#
+#       ICAP does not allow a single service to handle both REQMOD and RESPMOD
+#       transactions. Squid does not enforce that requirement. You can specify
+#       services with the same service_url and different vectoring_points. You
+#       can even specify multiple identical services as long as their
+#       service_names differ.
+#
+#       To activate a service, use the adaptation_access directive. To group
+#       services, use adaptation_service_chain and adaptation_service_set.
+#
+#       Service options are separated by white space. ICAP services support
+#       the following name=value options:
+#
+#       bypass=on|off|1|0
+#               If set to 'on' or '1', the ICAP service is treated as
+#               optional. If the service cannot be reached or malfunctions,
+#               Squid will try to ignore any errors and process the message as
+#               if the service was not enabled. No all ICAP errors can be
+#               bypassed.  If set to 0, the ICAP service is treated as
+#               essential and all ICAP errors will result in an error page
+#               returned to the HTTP client.
+#
+#               Bypass is off by default: services are treated as essential.
+#
+#       routing=on|off|1|0
+#               If set to 'on' or '1', the ICAP service is allowed to
+#               dynamically change the current message adaptation plan by
+#               returning a chain of services to be used next. The services
+#               are specified using the X-Next-Services ICAP response header
+#               value, formatted as a comma-separated list of service names.
+#               Each named service should be configured in squid.conf. Other
+#               services are ignored. An empty X-Next-Services value results
+#               in an empty plan which ends the current adaptation.
+#
+#               Dynamic adaptation plan may cross or cover multiple supported
+#               vectoring points in their natural processing order.
+#
+#               Routing is not allowed by default: the ICAP X-Next-Services
+#               response header is ignored.
+#
+#       ipv6=on|off
+#               Only has effect on split-stack systems. The default on those systems
+#               is to use IPv4-only connections. When set to 'on' this option will
+#               make Squid use IPv6-only connections to contact this ICAP service.
+#
+#       on-overload=block|bypass|wait|force
+#               If the service Max-Connections limit has been reached, do
+#               one of the following for each new ICAP transaction:
+#                 * block:  send an HTTP error response to the client
+#                 * bypass: ignore the "over-connected" ICAP service
+#                 * wait:   wait (in a FIFO queue) for an ICAP connection slot
+#                 * force:  proceed, ignoring the Max-Connections limit
+#
+#               In SMP mode with N workers, each worker assumes the service
+#               connection limit is Max-Connections/N, even though not all
+#               workers may use a given service.
+#
+#               The default value is "bypass" if service is bypassable,
+#               otherwise it is set to "wait".
+#
+#
+#       max-conn=number
+#               Use the given number as the Max-Connections limit, regardless
+#               of the Max-Connections value given by the service, if any.
+#
+#       Older icap_service format without optional named parameters is
+#       deprecated but supported for backward compatibility.
+#
+#Example:
+#icap_service svcBlocker reqmod_precache icap://icap1.mydomain.net:1344/reqmod bypass=0
+#icap_service svcLogger reqmod_precache icap://icap2.mydomain.net:1344/respmod routing=on
+#Default:
+# none
+
+#  TAG: icap_class
+#       This deprecated option was documented to define an ICAP service
+#       chain, even though it actually defined a set of similar, redundant
+#       services, and the chains were not supported.
+#
+#       To define a set of redundant services, please use the
+#       adaptation_service_set directive. For service chains, use
+#       adaptation_service_chain.
+#Default:
+# none
+
+#  TAG: icap_access
+#       This option is deprecated. Please use adaptation_access, which
+#       has the same ICAP functionality, but comes with better
+#       documentation, and eCAP support.
+#Default:
+# none
+
+# eCAP OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: ecap_enable     on|off
+#       Controls whether eCAP support is enabled.
+#Default:
+# ecap_enable off
+
+#  TAG: ecap_service
+#       Defines a single eCAP service
+#
+#       ecap_service id vectoring_point uri [option ...]
+#
+#        id: ID
+#               an opaque identifier or name which is used to direct traffic to
+#               this specific service. Must be unique among all adaptation
+#               services in squid.conf.
+#
+#       vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
+#               This specifies at which point of transaction processing the
+#               eCAP service should be activated. *_postcache vectoring points
+#               are not yet supported.
+#
+#       uri: ecap://vendor/service_name?custom&cgi=style&parameters=optional
+#               Squid uses the eCAP service URI to match this configuration
+#               line with one of the dynamically loaded services. Each loaded
+#               eCAP service must have a unique URI. Obtain the right URI from
+#               the service provider.
+#
+#       To activate a service, use the adaptation_access directive. To group
+#       services, use adaptation_service_chain and adaptation_service_set.
+#
+#       Service options are separated by white space. eCAP services support
+#       the following name=value options:
+#
+#       bypass=on|off|1|0
+#               If set to 'on' or '1', the eCAP service is treated as optional.
+#               If the service cannot be reached or malfunctions, Squid will try
+#               to ignore any errors and process the message as if the service
+#               was not enabled. No all eCAP errors can be bypassed.
+#               If set to 'off' or '0', the eCAP service is treated as essential
+#               and all eCAP errors will result in an error page returned to the
+#               HTTP client.
+#
+#                Bypass is off by default: services are treated as essential.
+#
+#       routing=on|off|1|0
+#               If set to 'on' or '1', the eCAP service is allowed to
+#               dynamically change the current message adaptation plan by
+#               returning a chain of services to be used next.
+#
+#               Dynamic adaptation plan may cross or cover multiple supported
+#               vectoring points in their natural processing order.
+#
+#               Routing is not allowed by default.
+#
+#       Older ecap_service format without optional named parameters is
+#       deprecated but supported for backward compatibility.
+#
+#
+#Example:
+#ecap_service s1 reqmod_precache ecap://filters.R.us/leakDetector?on_error=block bypass=off
+#ecap_service s2 respmod_precache ecap://filters.R.us/virusFilter config=/etc/vf.cfg bypass=on
+#Default:
+# none
+
+#  TAG: loadable_modules
+#       Instructs Squid to load the specified dynamic module(s) or activate
+#       preloaded module(s).
+#Example:
+#loadable_modules /usr/lib/MinimalAdapter.so
+#Default:
+# none
+
+# MESSAGE ADAPTATION OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: adaptation_service_set
+#
+#       Configures an ordered set of similar, redundant services. This is
+#       useful when hot standby or backup adaptation servers are available.
+#
+#           adaptation_service_set set_name service_name1 service_name2 ...
+#
+#       The named services are used in the set declaration order. The first
+#       applicable adaptation service from the set is used first. The next
+#       applicable service is tried if and only if the transaction with the
+#       previous service fails and the message waiting to be adapted is still
+#       intact.
+#
+#       When adaptation starts, broken services are ignored as if they were
+#       not a part of the set. A broken service is a down optional service.
+#
+#       The services in a set must be attached to the same vectoring point
+#       (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).
+#
+#       If all services in a set are optional then adaptation failures are
+#       bypassable. If all services in the set are essential, then a
+#       transaction failure with one service may still be retried using
+#       another service from the set, but when all services fail, the master
+#       transaction fails as well.
+#
+#       A set may contain a mix of optional and essential services, but that
+#       is likely to lead to surprising results because broken services become
+#       ignored (see above), making previously bypassable failures fatal.
+#       Technically, it is the bypassability of the last failed service that
+#       matters.
+#
+#       See also: adaptation_access adaptation_service_chain
+#
+#Example:
+#adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup
+#adaptation service_set svcLogger loggerLocal loggerRemote
+#Default:
+# none
+
+#  TAG: adaptation_service_chain
+#
+#       Configures a list of complementary services that will be applied
+#       one-by-one, forming an adaptation chain or pipeline. This is useful
+#       when Squid must perform different adaptations on the same message.
+#
+#           adaptation_service_chain chain_name service_name1 svc_name2 ...
+#
+#       The named services are used in the chain declaration order. The first
+#       applicable adaptation service from the chain is used first. The next
+#       applicable service is applied to the successful adaptation results of
+#       the previous service in the chain.
+#
+#       When adaptation starts, broken services are ignored as if they were
+#       not a part of the chain. A broken service is a down optional service.
+#
+#       Request satisfaction terminates the adaptation chain because Squid
+#       does not currently allow declaration of RESPMOD services at the
+#       "reqmod_precache" vectoring point (see icap_service or ecap_service).
+#
+#       The services in a chain must be attached to the same vectoring point
+#       (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).
+#
+#       A chain may contain a mix of optional and essential services. If an
+#       essential adaptation fails (or the failure cannot be bypassed for
+#       other reasons), the master transaction fails. Otherwise, the failure
+#       is bypassed as if the failed adaptation service was not in the chain.
+#
+#       See also: adaptation_access adaptation_service_set
+#
+#Example:
+#adaptation_service_chain svcRequest requestLogger urlFilter leakDetector
+#Default:
+# none
+
+#  TAG: adaptation_access
+#       Sends an HTTP transaction to an ICAP or eCAP adaptation service.
+#
+#       adaptation_access service_name allow|deny [!]aclname...
+#       adaptation_access set_name     allow|deny [!]aclname...
+#
+#       At each supported vectoring point, the adaptation_access
+#       statements are processed in the order they appear in this
+#       configuration file. Statements pointing to the following services
+#       are ignored (i.e., skipped without checking their ACL):
+#
+#           - services serving different vectoring points
+#           - "broken-but-bypassable" services
+#           - "up" services configured to ignore such transactions
+#              (e.g., based on the ICAP Transfer-Ignore header).
+#
+#        When a set_name is used, all services in the set are checked
+#       using the same rules, to find the first applicable one. See
+#       adaptation_service_set for details.
+#
+#       If an access list is checked and there is a match, the
+#       processing stops: For an "allow" rule, the corresponding
+#       adaptation service is used for the transaction. For a "deny"
+#       rule, no adaptation service is activated.
+#
+#       It is currently not possible to apply more than one adaptation
+#       service at the same vectoring point to the same HTTP transaction.
+#
+#        See also: icap_service and ecap_service
+#
+#Example:
+#adaptation_access service_1 allow all
+#Default:
+# Allow, unless rules exist in squid.conf.
+
+#  TAG: adaptation_service_iteration_limit
+#       Limits the number of iterations allowed when applying adaptation
+#       services to a message. If your longest adaptation set or chain
+#       may have more than 16 services, increase the limit beyond its
+#       default value of 16. If detecting infinite iteration loops sooner
+#       is critical, make the iteration limit match the actual number
+#       of services in your longest adaptation set or chain.
+#
+#       Infinite adaptation loops are most likely with routing services.
+#
+#       See also: icap_service routing=1
+#Default:
+# adaptation_service_iteration_limit 16
+
+#  TAG: adaptation_masterx_shared_names
+#       For each master transaction (i.e., the HTTP request and response
+#       sequence, including all related ICAP and eCAP exchanges), Squid
+#       maintains a table of metadata. The table entries are (name, value)
+#       pairs shared among eCAP and ICAP exchanges. The table is destroyed
+#       with the master transaction.
+#
+#       This option specifies the table entry names that Squid must accept
+#       from and forward to the adaptation transactions.
+#
+#       An ICAP REQMOD or RESPMOD transaction may set an entry in the
+#       shared table by returning an ICAP header field with a name
+#       specified in adaptation_masterx_shared_names.
+#
+#       An eCAP REQMOD or RESPMOD transaction may set an entry in the
+#       shared table by implementing the libecap::visitEachOption() API
+#       to provide an option with a name specified in
+#       adaptation_masterx_shared_names.
+#
+#       Squid will store and forward the set entry to subsequent adaptation
+#       transactions within the same master transaction scope.
+#
+#       Only one shared entry name is supported at this time.
+#
+#Example:
+## share authentication information among ICAP services
+#adaptation_masterx_shared_names X-Subscriber-ID
+#Default:
+# none
+
+#  TAG: adaptation_meta
+#       This option allows Squid administrator to add custom ICAP request
+#       headers or eCAP options to Squid ICAP requests or eCAP transactions.
+#       Use it to pass custom authentication tokens and other
+#       transaction-state related meta information to an ICAP/eCAP service.
+#
+#       The addition of a meta header is ACL-driven:
+#               adaptation_meta name value [!]aclname ...
+#
+#       Processing for a given header name stops after the first ACL list match.
+#       Thus, it is impossible to add two headers with the same name. If no ACL
+#       lists match for a given header name, no such header is added. For
+#       example:
+#
+#               # do not debug transactions except for those that need debugging
+#               adaptation_meta X-Debug 1 needs_debugging
+#
+#               # log all transactions except for those that must remain secret
+#               adaptation_meta X-Log 1 !keep_secret
+#
+#               # mark transactions from users in the "G 1" group
+#               adaptation_meta X-Authenticated-Groups "G 1" authed_as_G1
+#
+#       The "value" parameter may be a regular squid.conf token or a "double
+#       quoted string". Within the quoted string, use backslash (\) to escape
+#       any character, which is currently only useful for escaping backslashes
+#       and double quotes. For example,
+#           "this string has one backslash (\\) and two \"quotes\""
+#
+#       Used adaptation_meta header values may be logged via %note
+#       logformat code. If multiple adaptation_meta headers with the same name
+#       are used during master transaction lifetime, the header values are
+#       logged in the order they were used and duplicate values are ignored
+#       (only the first repeated value will be logged).
+#Default:
+# none
+
+#  TAG: icap_retry
+#       This ACL determines which retriable ICAP transactions are
+#       retried. Transactions that received a complete ICAP response
+#       and did not have to consume or produce HTTP bodies to receive
+#       that response are usually retriable.
+#
+#       icap_retry allow|deny [!]aclname ...
+#
+#       Squid automatically retries some ICAP I/O timeouts and errors
+#       due to persistent connection race conditions.
+#
+#       See also: icap_retry_limit
+#Default:
+# icap_retry deny all
+
+#  TAG: icap_retry_limit
+#       Limits the number of retries allowed.
+#
+#       Communication errors due to persistent connection race
+#       conditions are unavoidable, automatically retried, and do not
+#       count against this limit.
+#
+#       See also: icap_retry
+#Default:
+# No retries are allowed.
+
+# DNS OPTIONS
+# -----------------------------------------------------------------------------
+
+#  TAG: check_hostnames
+#       For security and stability reasons Squid can check
+#       hostnames for Internet standard RFC compliance. If you want
+#       Squid to perform these checks turn this directive on.
+#Default:
+# check_hostnames off
+
+#  TAG: allow_underscore
+#       Underscore characters is not strictly allowed in Internet hostnames
+#       but nevertheless used by many sites. Set this to off if you want
+#       Squid to be strict about the standard.
+#       This check is performed only when check_hostnames is set to on.
+#Default:
+# allow_underscore on
+
+#  TAG: dns_retransmit_interval
+#       Initial retransmit interval for DNS queries. The interval is
+#       doubled each time all configured DNS servers have been tried.
+#Default:
+# dns_retransmit_interval 5 seconds
+
+#  TAG: dns_timeout
+#       DNS Query timeout. If no response is received to a DNS query
+#       within this time all DNS servers for the queried domain
+#       are assumed to be unavailable.
+#Default:
+# dns_timeout 30 seconds
+
+#  TAG: dns_packet_max
+#       Maximum number of bytes packet size to advertise via EDNS.
+#       Set to "none" to disable EDNS large packet support.
+#
+#       For legacy reasons DNS UDP replies will default to 512 bytes which
+#       is too small for many responses. EDNS provides a means for Squid to
+#       negotiate receiving larger responses back immediately without having
+#       to failover with repeat requests. Responses larger than this limit
+#       will retain the old behaviour of failover to TCP DNS.
+#
+#       Squid has no real fixed limit internally, but allowing packet sizes
+#       over 1500 bytes requires network jumbogram support and is usually not
+#       necessary.
+#
+#       WARNING: The RFC also indicates that some older resolvers will reply
+#       with failure of the whole request if the extension is added. Some
+#       resolvers have already been identified which will reply with mangled
+#       EDNS response on occasion. Usually in response to many-KB jumbogram
+#       sizes being advertised by Squid.
+#       Squid will currently treat these both as an unable-to-resolve domain
+#       even if it would be resolvable without EDNS.
+#Default:
+# EDNS disabled
+
+#  TAG: dns_defnames    on|off
+#       Normally the RES_DEFNAMES resolver option is disabled
+#       (see res_init(3)).  This prevents caches in a hierarchy
+#       from interpreting single-component hostnames locally.  To allow
+#       Squid to handle single-component names, enable this option.
+#Default:
+# Search for single-label domain names is disabled.
+
+#  TAG: dns_multicast_local     on|off
+#       When set to on, Squid sends multicast DNS lookups on the local
+#       network for domains ending in .local and .arpa.
+#       This enables local servers and devices to be contacted in an
+#       ad-hoc or zero-configuration network environment.
+#Default:
+# Search for .local and .arpa names is disabled.
+
+#  TAG: dns_nameservers
+#       Use this if you want to specify a list of DNS name servers
+#       (IP addresses) to use instead of those given in your
+#       /etc/resolv.conf file.
+#
+#       On Windows platforms, if no value is specified here or in
+#       the /etc/resolv.conf file, the list of DNS name servers are
+#       taken from the Windows registry, both static and dynamic DHCP
+#       configurations are supported.
+#
+#       Example: dns_nameservers 10.0.0.1 192.172.0.4
+#Default:
+# Use operating system definitions
+
+#  TAG: hosts_file
+#       Location of the host-local IP name-address associations
+#       database. Most Operating Systems have such a file on different
+#       default locations:
+#       - Un*X & Linux:    /etc/hosts
+#       - Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts
+#                          (%SystemRoot% value install default is c:\winnt)
+#       - Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts
+#                          (%SystemRoot% value install default is c:\windows)
+#       - Windows 9x/Me:   %windir%\hosts
+#                          (%windir% value is usually c:\windows)
+#       - Cygwin:          /etc/hosts
+#
+#       The file contains newline-separated definitions, in the
+#       form ip_address_in_dotted_form name [name ...] names are
+#       whitespace-separated. Lines beginning with an hash (#)
+#       character are comments.
+#
+#       The file is checked at startup and upon configuration.
+#       If set to 'none', it won't be checked.
+#       If append_domain is used, that domain will be added to
+#       domain-local (i.e. not containing any dot character) host
+#       definitions.
+#Default:
+# hosts_file /etc/hosts
+
+#  TAG: append_domain
+#       Appends local domain name to hostnames without any dots in
+#       them.  append_domain must begin with a period.
+#
+#       Be warned there are now Internet names with no dots in
+#       them using only top-domain names, so setting this may
+#       cause some Internet sites to become unavailable.
+#
+#Example:
+# append_domain .yourdomain.com
+#Default:
+# Use operating system definitions
+
+#  TAG: ignore_unknown_nameservers
+#       By default Squid checks that DNS responses are received
+#       from the same IP addresses they are sent to.  If they
+#       don't match, Squid ignores the response and writes a warning
+#       message to cache.log.  You can allow responses from unknown
+#       nameservers by setting this option to 'off'.
+#Default:
+# ignore_unknown_nameservers on
+
+#  TAG: dns_v4_first
+#       With the IPv6 Internet being as fast or faster than IPv4 Internet
+#       for most networks Squid prefers to contact websites over IPv6.
+#
+#       This option reverses the order of preference to make Squid contact
+#       dual-stack websites over IPv4 first. Squid will still perform both
+#       IPv6 and IPv4 DNS lookups before connecting.
+#
+#       WARNING:
+#         This option will restrict the situations under which IPv6
+#         connectivity is used (and tested), potentially hiding network
+#         problems which would otherwise be detected and warned about.
+#Default:
+# dns_v4_first off
+
+#  TAG: ipcache_size    (number of entries)
+#       Maximum number of DNS IP cache entries.
+#Default:
+# ipcache_size 1024
+
+#  TAG: ipcache_low     (percent)
+#Default:
+# ipcache_low 90
+
+#  TAG: ipcache_high    (percent)
+#       The size, low-, and high-water marks for the IP cache.
+#Default:
+# ipcache_high 95
+
+#  TAG: fqdncache_size  (number of entries)
+#       Maximum number of FQDN cache entries.
+#Default:
+# fqdncache_size 1024
+
+# MISCELLANEOUS
+# -----------------------------------------------------------------------------
+
+#  TAG: configuration_includes_quoted_values    on|off
+#       If set, Squid will recognize each "quoted string" after a configuration
+#       directive as a single parameter. The quotes are stripped before the
+#       parameter value is interpreted or used.
+#       See "Values with spaces, quotes, and other special characters"
+#       section for more details.
+#Default:
+# configuration_includes_quoted_values off
+
+#  TAG: memory_pools    on|off
+#       If set, Squid will keep pools of allocated (but unused) memory
+#       available for future use.  If memory is a premium on your
+#       system and you believe your malloc library outperforms Squid
+#       routines, disable this.
+#Default:
+# memory_pools on
+
+#  TAG: memory_pools_limit      (bytes)
+#       Used only with memory_pools on:
+#       memory_pools_limit 50 MB
+#
+#       If set to a non-zero value, Squid will keep at most the specified
+#       limit of allocated (but unused) memory in memory pools. All free()
+#       requests that exceed this limit will be handled by your malloc
+#       library. Squid does not pre-allocate any memory, just safe-keeps
+#       objects that otherwise would be free()d. Thus, it is safe to set
+#       memory_pools_limit to a reasonably high value even if your
+#       configuration will use less memory.
+#
+#       If set to none, Squid will keep all memory it can. That is, there
+#       will be no limit on the total amount of memory used for safe-keeping.
+#
+#       To disable memory allocation optimization, do not set
+#       memory_pools_limit to 0 or none. Set memory_pools to "off" instead.
+#
+#       An overhead for maintaining memory pools is not taken into account
+#       when the limit is checked. This overhead is close to four bytes per
+#       object kept. However, pools may actually _save_ memory because of
+#       reduced memory thrashing in your malloc library.
+#Default:
+# memory_pools_limit 5 MB
+
+#  TAG: forwarded_for   on|off|transparent|truncate|delete
+#       If set to "on", Squid will append your client's IP address
+#       in the HTTP requests it forwards. By default it looks like:
+#
+#               X-Forwarded-For: 192.1.2.3
+#
+#       If set to "off", it will appear as
+#
+#               X-Forwarded-For: unknown
+#
+#       If set to "transparent", Squid will not alter the
+#       X-Forwarded-For header in any way.
+#
+#       If set to "delete", Squid will delete the entire
+#       X-Forwarded-For header.
+#
+#       If set to "truncate", Squid will remove all existing
+#       X-Forwarded-For entries, and place the client IP as the sole entry.
+#Default:
+# forwarded_for on
+
+#  TAG: cachemgr_passwd
+#       Specify passwords for cachemgr operations.
+#
+#       Usage: cachemgr_passwd password action action ...
+#
+#       Some valid actions are (see cache manager menu for a full list):
+#               5min
+#               60min
+#               asndb
+#               authenticator
+#               cbdata
+#               client_list
+#               comm_incoming
+#               config *
+#               counters
+#               delay
+#               digest_stats
+#               dns
+#               events
+#               filedescriptors
+#               fqdncache
+#               histograms
+#               http_headers
+#               info
+#               io
+#               ipcache
+#               mem
+#               menu
+#               netdb
+#               non_peers
+#               objects
+#               offline_toggle *
+#               pconn
+#               peer_select
+#               reconfigure *
+#               redirector
+#               refresh
+#               server_list
+#               shutdown *
+#               store_digest
+#               storedir
+#               utilization
+#               via_headers
+#               vm_objects
+#
+#       * Indicates actions which will not be performed without a
+#         valid password, others can be performed if not listed here.
+#
+#       To disable an action, set the password to "disable".
+#       To allow performing an action without a password, set the
+#       password to "none".
+#
+#       Use the keyword "all" to set the same password for all actions.
+#
+#Example:
+# cachemgr_passwd secret shutdown
+# cachemgr_passwd lesssssssecret info stats/objects
+# cachemgr_passwd disable all
+#Default:
+# No password. Actions which require password are denied.
+
+#  TAG: client_db       on|off
+#       If you want to disable collecting per-client statistics,
+#       turn off client_db here.
+#Default:
+# client_db on
+
+#  TAG: refresh_all_ims on|off
+#       When you enable this option, squid will always check
+#       the origin server for an update when a client sends an
+#       If-Modified-Since request.  Many browsers use IMS
+#       requests when the user requests a reload, and this
+#       ensures those clients receive the latest version.
+#
+#       By default (off), squid may return a Not Modified response
+#       based on the age of the cached version.
+#Default:
+# refresh_all_ims off
+
+#  TAG: reload_into_ims on|off
+#       When you enable this option, client no-cache or ``reload''
+#       requests will be changed to If-Modified-Since requests.
+#       Doing this VIOLATES the HTTP standard.  Enabling this
+#       feature could make you liable for problems which it
+#       causes.
+#
+#       see also refresh_pattern for a more selective approach.
+#Default:
+# reload_into_ims off
+
+#  TAG: connect_retries
+#       This sets the maximum number of connection attempts made for each
+#       TCP connection. The connect_retries attempts must all still
+#       complete within the connection timeout period.
+#
+#       The default is not to re-try if the first connection attempt fails.
+#       The (not recommended) maximum is 10 tries.
+#
+#       A warning message will be generated if it is set to a too-high
+#       value and the configured value will be over-ridden.
+#
+#       Note: These re-tries are in addition to forward_max_tries
+#       which limit how many different addresses may be tried to find
+#       a useful server.
+#Default:
+# Do not retry failed connections.
+
+#  TAG: retry_on_error
+#       If set to ON Squid will automatically retry requests when
+#       receiving an error response with status 403 (Forbidden),
+#       500 (Internal Error), 501 or 503 (Service not available).
+#       Status 502 and 504 (Gateway errors) are always retried.
+#
+#       This is mainly useful if you are in a complex cache hierarchy to
+#       work around access control errors.
+#
+#       NOTE: This retry will attempt to find another working destination.
+#       Which is different from the server which just failed.
+#Default:
+# retry_on_error off
+
+#  TAG: as_whois_server
+#       WHOIS server to query for AS numbers.  NOTE: AS numbers are
+#       queried only when Squid starts up, not for every request.
+#Default:
+# as_whois_server whois.ra.net
+
+#  TAG: offline_mode
+#       Enable this option and Squid will never try to validate cached
+#       objects.
+#Default:
+# offline_mode off
+
+#  TAG: uri_whitespace
+#       What to do with requests that have whitespace characters in the
+#       URI.  Options:
+#
+#       strip:  The whitespace characters are stripped out of the URL.
+#               This is the behavior recommended by RFC2396 and RFC3986
+#               for tolerant handling of generic URI.
+#               NOTE: This is one difference between generic URI and HTTP URLs.
+#
+#       deny:   The request is denied.  The user receives an "Invalid
+#               Request" message.
+#               This is the behaviour recommended by RFC2616 for safe
+#               handling of HTTP request URL.
+#
+#       allow:  The request is allowed and the URI is not changed.  The
+#               whitespace characters remain in the URI.  Note the
+#               whitespace is passed to redirector processes if they
+#               are in use.
+#               Note this may be considered a violation of RFC2616
+#               request parsing where whitespace is prohibited in the
+#               URL field.
+#
+#       encode: The request is allowed and the whitespace characters are
+#               encoded according to RFC1738.
+#
+#       chop:   The request is allowed and the URI is chopped at the
+#               first whitespace.
+#
+#
+#       NOTE the current Squid implementation of encode and chop violates
+#       RFC2616 by not using a 301 redirect after altering the URL.
+#Default:
+# uri_whitespace strip
+
+#  TAG: chroot
+#       Specifies a directory where Squid should do a chroot() while
+#       initializing.  This also causes Squid to fully drop root
+#       privileges after initializing.  This means, for example, if you
+#       use a HTTP port less than 1024 and try to reconfigure, you may
+#       get an error saying that Squid can not open the port.
+#Default:
+# none
+
+#  TAG: balance_on_multiple_ip
+#       Modern IP resolvers in squid sort lookup results by preferred access.
+#       By default squid will use these IP in order and only rotates to
+#       the next listed when the most preffered fails.
+#
+#       Some load balancing servers based on round robin DNS have been
+#       found not to preserve user session state across requests
+#       to different IP addresses.
+#
+#       Enabling this directive Squid rotates IP's per request.
+#Default:
+# balance_on_multiple_ip off
+
+#  TAG: pipeline_prefetch
+#       HTTP clients may send a pipeline of 1+N requests to Squid using a
+#       single connection, without waiting for Squid to respond to the first
+#       of those requests. This option limits the number of concurrent
+#       requests Squid will try to handle in parallel. If set to N, Squid
+#       will try to receive and process up to 1+N requests on the same
+#       connection concurrently.
+#
+#       Defaults to 0 (off) for bandwidth management and access logging
+#       reasons.
+#
+#       NOTE: pipelining requires persistent connections to clients.
+#
+#       WARNING: pipelining breaks NTLM and Negotiate/Kerberos authentication.
+#Default:
+# Do not pre-parse pipelined requests.
+
+#  TAG: high_response_time_warning      (msec)
+#       If the one-minute median response time exceeds this value,
+#       Squid prints a WARNING with debug level 0 to get the
+#       administrators attention.  The value is in milliseconds.
+#Default:
+# disabled.
+
+#  TAG: high_page_fault_warning
+#       If the one-minute average page fault rate exceeds this
+#       value, Squid prints a WARNING with debug level 0 to get
+#       the administrators attention.  The value is in page faults
+#       per second.
+#Default:
+# disabled.
+
+#  TAG: high_memory_warning
+# Note: This option is only available if Squid is rebuilt with the
+#       GNU Malloc with mstats()
+#
+#       If the memory usage (as determined by gnumalloc, if available and used)
+#       exceeds this amount, Squid prints a WARNING with debug level 0 to get
+#       the administrators attention.
+#Default:
+# disabled.
+
+#  TAG: sleep_after_fork        (microseconds)
+#       When this is set to a non-zero value, the main Squid process
+#       sleeps the specified number of microseconds after a fork()
+#       system call. This sleep may help the situation where your
+#       system reports fork() failures due to lack of (virtual)
+#       memory. Note, however, if you have a lot of child
+#       processes, these sleep delays will add up and your
+#       Squid will not service requests for some amount of time
+#       until all the child processes have been started.
+#       On Windows value less then 1000 (1 milliseconds) are
+#       rounded to 1000.
+#Default:
+# sleep_after_fork 0
+
+#  TAG: windows_ipaddrchangemonitor     on|off
+# Note: This option is only available if Squid is rebuilt with the
+#       MS Windows
+#
+#       On Windows Squid by default will monitor IP address changes and will
+#       reconfigure itself after any detected event. This is very useful for
+#       proxies connected to internet with dial-up interfaces.
+#       In some cases (a Proxy server acting as VPN gateway is one) it could be
+#       desiderable to disable this behaviour setting this to 'off'.
+#       Note: after changing this, Squid service must be restarted.
+#Default:
+# windows_ipaddrchangemonitor on
+
+#  TAG: eui_lookup
+#       Whether to lookup the EUI or MAC address of a connected client.
+#Default:
+# eui_lookup on
+
+#  TAG: max_filedescriptors
+#       Reduce the maximum number of filedescriptors supported below
+#       the usual operating system defaults.
+#
+#       Remove from squid.conf to inherit the current ulimit setting.
+#
+#       Note: Changing this requires a restart of Squid. Also
+#       not all I/O types supports large values (eg on Windows).
+#Default:
+# Use operating system limits set by ulimit.