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Re: Expect: 100-continue and proxies

From: Henrik Nordström <henrik@henriknordstrom.net>
Date: Fri, 14 May 2010 11:52:24 +0200
To: Joe Orton <joe@manyfish.co.uk>
Cc: ietf-http-wg@w3.org
Message-Id: <1273830744.8870.27.camel@localhost.localdomain>
mån 2010-02-22 klockan 09:36 +0000 skrev Joe Orton:
> Ah, I wasn't clear here: httpd/mod_proxy will, given a request 
> containing "Expect: 100-continue":
> 1) send the request including the Expect header to the next hop
> 2) generate and send a "100 Continue" to the client

2 there is a clear violation. Intermediaries MUST NOT generate 1xx

> 3) read the request body from the client and forward it to the next hop
> 4) read the response from the next hop and forward it to the client
> So I guess this seems to comply with the letter of 2616 ("MUST forward 
> the request, including the Expect header field") but not the spirit: 
> that Expect is handled end-to-end, not hop-by-hop.


Expect is supposed to be handled hop-by-hop but sent end-to-end. There
is severaly MUST NOT forward the request clauses attached to Expect.

1xx responses is end-to-end.

417 responses is used at hop-by-hop Expect processing to signal that the
expectation can not be met if needed.

Received on Friday, 14 May 2010 09:53:07 UTC

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