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Re: Still trying to make sense of HTTP caching model

From: Shel Kaphan <sjk@amazon.com>
Date: Wed, 6 Sep 1995 12:02:10 -0700
Message-Id: <199509061902.MAA20887@bert.amazon.com>
To: Roy Fielding <fielding@beach.w3.org>
Cc: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
Roy Fielding writes:
 > >This usage encodes some very non-intuitive semantics in the Expires:
 > >heading.  If you want to tell the proxy to cache a document but always
 > >validate it then create a header or Pragma to do that.
 > 
 > Just as an informational point, I already included these semantics
 > in draft 01 for the "max-age" (now Cache-Control: max-age=NNN) parameter.
 > 
 >  ....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)

So, in what sense, other than the representation of time, is this
different from Expires (as a response header)?  And if it is not
different, why does it exist?
Received on Wednesday, 6 September 1995 12:08:30 EDT

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