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Re: If-Modified-Since No Longer Cool?

From: Henrik Frystyk Nielsen <frystyk@w3.org>
Date: Mon, 07 Oct 1996 16:57:49 -0400
Message-Id: <199610072057.QAA23275@anansi.w3.org>
To: Ari Luotonen <luotonen@netscape.com>
cc: jjames@firstfloor.COM (John W. James), www-talk@w3.org
Ari Luotonen writes:
> 
> > Are there good reasons I just can't think of for not supporting
> > If-modified-since in the request? Did I take a nap and miss a format change
 ?
> > 
> > GET / HTTP/1.0
> > If-Modified-Since: Monday, 07-Oct-96 16:00:00 GMT
> 
> That's one of the older formats.  The best thing to use is the
> preferred format with full 4-digit year, that is:
> 
> If-Modified-Since: Mon, 07 Oct 1996 16:00:00 GMT
> 
> or use blindly the same string as is sent by the server in the Date:
> header.

Hopefully, etags will be the preferred way to validate caches in HTTP/1.1
applications. That way, we avoid the resolution being 1 sec, millions
of different date/time formats, the 2000 problem, time zones, and lack of
time synchronization.

Henrik

-- 
Henrik Frystyk Nielsen, <frystyk@w3.org>
World Wide Web Consortium, MIT/LCS NE43-356
545 Technology Square, Cambridge MA 02139, USA
Received on Monday, 7 October 1996 16:58:01 GMT

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