[8879] in www-talk@info.cern.ch
Re: Session-ID proposal
daemon@ATHENA.MIT.EDU (Roy Fielding)
Fri Aug 11 16:41:15 1995
To: dmk@allegra.att.com (Dave Kristol)
Cc: sjk@amazon.com, www-talk@www10.w3.org
In-Reply-To: Your message of "Thu, 10 Aug 1995 17:48:43 EDT."
<9508102154.AA29296@www10.w3.org>
Date: Fri, 11 Aug 1995 16:37:38 -0400
From: Roy Fielding <fielding@beach.w3.org>
Resent-From: www-talk@w3.org
>I have assumed (erroneously?) that a caching proxy must send
>conditional GETs to the origin server. If so, there's already the cost
>of a connection. The State-Info (previously "Session-ID") can ride the
>request almost for free.
This is, in fact, erroneous. The conditional GET mechanism exists
to allow efficient cache updates -- why the cache is updated is up
to the cache manager. It is *not* broken if it chooses to service a
request from its cache, unless there are clear instructions in the
request or in the cached message indicating that it should not do so.
....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)
