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Re: HTTP/1.1 & Proxies

From: Roy T. Fielding <fielding@kiwi.ICS.UCI.EDU>
Date: Tue, 01 Jul 1997 14:23:09 -0700
To: Henrik Frystyk Nielsen <frystyk@w3.org>
Cc: http-wg@cuckoo.hpl.hp.com, w3c-http@w3.org
Message-Id: <9707011429.aa22590@paris.ics.uci.edu>
X-Mailing-List: <http-wg@cuckoo.hpl.hp.com> archive/latest/3608
>One problem using the OPTIONS method is that it has to be forwarded to an
>origin server.


    OPTIONS * HTTP/1.1
    Host: blah

is never forwarded.  Besides, even if you include a full URL to
test the whole proxy chain, the OPTIONS method is still safe.

In general, there is no way to modify HTTP such that an invisible
broken proxy can be detected.  The only hope is to perform a safe
action as a test and get a broken response if they are in the loop,
and to abuse those developers who think they can implement network
software without reading the specs.

BTW, I suggest including a mini-app that can perform an OPTIONS and
TRACE and save the result to a file.  If nothing else, it will make
diagnosing network configuration problems easier.

Received on Tuesday, 1 July 1997 15:06:27 UTC

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