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From Brian Behlendorf <>
Subject proxy not sending "Via:" header..?
Date Thu, 14 Nov 1996 07:58:40 GMT

My understanding, perhaps incorrect, was that proxy servers should send a Via:
header when they relay a request, i.e.

Via: Apache/1.2

or something like that, other than the conventional way which is to tack it
onto the User-Agent header.  Apache doesn't seem to do that; which worries me,
as apparently there's nothing in proxy requests which distinguish them from
direct connections, and thus any attempt I as a server maintainer or statistics
gatherer might try to do to tell how many requests are coming to me via a proxy
server are somewhat thwarted.  On the other hand, for privacy or "equality of
content" reasons it might be best to make the proxy as transparant as
possible.  Thoughts?


correction: I do see the proxy sending along a "Proxy-Connection:" header as a
distinguishing characteristic, but not much else.


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