[Nagiosplug-help] check_http HTTP Version

[Franz, Jay]

> * Franz, Jay <Jay.Franz at ssa.gov> [2011-09-14 12:43]:
> > > Try using -H and supplying a host that does 1.1 requests for me...
> >
> > [...]
> >
> > Understanding that it now works, I am not sure that I understand why.  I
> > thought that the -H option was for virtual hosts?  And, why would it
> > work with both "$HOSTNAME$" and "$HOSTADDRESS$"?  That is, from the
> > plug-in's point of view, what is the difference between -I
> > "$HOSTADDRESS$" and -H "$HOSTADDRESS$"?
> 
> The -I option tells the plugin which host to connect to (as the -H
> option of other plugins).  The -H option tells the plugin to set the
> "Host" header field of the client request to the specified string, which
> indeed is required to check virtual hosts.¹  The HTTP/1.0 protocol
> doesn't define such a header field, so the plugin uses HTTP/1.1 when -H
> is specified.
> 
> Holger
> 
> ¹ See: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23

Ah, it always pays to understand the underlying protocols.  Thanks, for the explanation and the reference.  

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