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Re: Rigorously defining the interaction of conditional headers

From: John Franks <john@math.nwu.edu>
Date: Thu, 5 Mar 1998 08:56:25 -0600 (CST)
To: "Roy T. Fielding" <fielding@kiwi.ics.uci.edu>
Cc: Jeffrey Mogul <mogul@pa.dec.com>, http-wg@cuckoo.hpl.hp.com
Message-Id: <Pine.LNX.3.96.980305085357.12661A-100000@hopf.math.nwu.edu>
X-Mailing-List: <http-wg@cuckoo.hpl.hp.com> archive/latest/5435
On Thu, 5 Mar 1998, Roy T. Fielding wrote:

> That can be added to the spec if desired, but the important thing is that
> the specification must define a precedence in order to avoid contradictions.
> Since precondition checks >> validation checks and etag checks > last_mod,
> the only sensible precedence is
>     If-Match > If-Unmodified-Since > If-None-Match > If-Modified-Since

This is certainly clear and simple.  But, why do precondition checks 
take precedence over validation checks?  While we are on the subject,
what is the purpose of the precondition checks?

John Franks
Received on Thursday, 5 March 1998 06:57:38 UTC

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