[monitoring-plugins] check_curl: add docs about https proxy

[Sven Nierlein]

 Module: monitoring-plugins
 Branch: feature_check_curl
 Commit: b5ae9fe9813a1b569014efaa4068a93d1022c9a5
 Author: Sven Nierlein <sven at nierlein.de>
   Date: Sun May 28 10:16:01 2017 +0200
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=b5ae9fe

check_curl: add docs about https proxy

---

 plugins/check_curl.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index 82324d3..e7e05a5 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -1709,7 +1709,10 @@ print_help (void)
   printf (" %s\n", _("A STATE_CRITICAL will be returned when certificate expires in less than 14 days"));
 
   printf (" %s\n\n", "CHECK SSL WEBSERVER CONTENT VIA PROXY USING HTTP 1.1 CONNECT: ");
-  printf (" %s\n", _("check_curl -I 192.168.100.35 -p 80 -u https://www.verisign.com/ -S -j CONNECT -H www.verisign.com "));
+  printf (" %s\n", _("It is recommended to use an environment proxy like:"));
+  printf (" %s\n", _("https_proxy=http://127.0.0.1:3128 ./check_curl -H www.verisign.com -S"));
+  printf (" %s\n", _("but proxy requests in check_http style still works:"));
+  printf (" %s\n", _("check_curl -I 192.168.100.35 -p 3128 -u https://www.verisign.com/ -S -j CONNECT -H www.verisign.com "));
   printf (" %s\n", _("all these options are needed: -I <proxy> -p <proxy-port> -u <check-url> -S(sl) -j CONNECT -H <webserver>"));
   printf (" %s\n", _("a STATE_OK will be returned. When the server returns its content but exceeds"));
   printf (" %s\n", _("the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,"));