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Re: new editorial(?) issue HEAD_WITH_IMS

From: Roy T. Fielding <fielding@kiwi.ics.uci.edu>
Date: Thu, 05 Mar 1998 01:43:48 -0800
To: Jeffrey Mogul <mogul@pa.dec.com>
Cc: http-wg@cuckoo.hpl.hp.com
Message-Id: <9803050145.aa02181@paris.ics.uci.edu>
>Our intuition is that, based on the language in 9.4, any headers
>allowed with GET should be allowed with HEAD (and interpreted
>the same way by the server).  I.e., the language in 14.24
>should be changed to
>	The If-Modified-Since request-header field is used with the
>	GET (or HEAD) method to make it conditional ...

That is what we decided the last time this issue was discussed,
which is why Apache was changed accordingly.

>or even
>	The If-Modified-Since request-header field is used with a
>	method to make it conditional ...

That would lead to complications.  The semantics of If-Modified-Since
(return 200 if true, 304 if false) do not make any sense for other methods.

....Roy
Received on Thursday, 5 March 1998 01:57:17 EST

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