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Re: Improving If-Modified-Since

From: Roy Fielding <fielding@beach.w3.org>
Date: Tue, 15 Aug 1995 16:50:36 -0400
Message-Id: <199508152050.QAA32198@beach.w3.org>
To: Lou Montulli <montulli@mozilla.com>
Cc: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
>Are you sure it will break MacHTTP and WebSTAR, or do you just assume it
>will?  If it does, these servers are not following the spec.  HTTP
>headers are MIME headers, and MIME headers can always be followed by
>a semi-colon and additional attributes.

Er, well, no, that is only true of headers which contain

   *(";" parameter)

as part of the definition.  Each known header's field value is defined
according to the specific BNF for that header -- the generic header parsing
BNF only applies when the header name is unknown or when the parser
is not looking inside the field value.

However, it is a good rule to follow for robust implementations,
and we are not talking about a change to HTTP/1.0, but rather HTTP/1.1,
where we are able to change specific header-parsing within reason.

 ....Roy T. Fielding  Department of ICS, University of California, Irvine USA
                      Visiting Scholar, MIT/LCS + World-Wide Web Consortium
                      (fielding@w3.org)                (fielding@ics.uci.edu)
Received on Tuesday, 15 August 1995 14:07:29 UTC

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