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Re: Question about HTTP/1.1 and proxy servers

From: Ari Luotonen <luotonen@netscape.com>
Date: Wed, 1 Oct 1997 10:42:08 -0700 (PDT)
Message-Id: <199710011742.KAA04497@step.mcom.com>
To: "Babin, Francois" <francois.babin.fbabin@nortel.com>
Cc: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com 

> As I don't seem to get any answer to my question within the usenet,
> you might be able to help me here.
> 
> Is there any way, on the server side, to identify if a request
> originated by an http client has passed through a proxy ? Is there
> anything that a proxy changes within the HTTP request/header before
> forwarding it that could be used ?

Yes, but depending on the version of the proxy server software, this
information may be in different places.  Here are the possibilities:

	- "Via:" header (HTTP/1.1)
	- "Forwarded:" header (some HTTP/1.0 implementations)
	- "User-Agent: ... via <proxy-software>" (CERN proxy)

Cheers,
--
Ari Luotonen, Mail-Stop MV-061		Opinions my own, not Netscape's.
Netscape Communications Corp.		ari@netscape.com
501 East Middlefield Road		http://people.netscape.com/ari/
Mountain View, CA 94043, USA		Netscape Proxy Server Development
Received on Wednesday, 1 October 1997 10:45:29 EDT

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