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Re: Improving If-Modified-Since

From: Rob Hartill <hartill@ooo.lanl.gov>
Date: Tue, 15 Aug 95 14:10:30 MDT
Message-Id: <199508152010.AA025297431@ooo.lanl.gov>
To: montulli@mozilla.com
Cc: fielding@beach.w3.org, http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
> > and must not include an If-Modified-Since header.  Navigator 1.1N sends
> > the no-cache directive, but also sends IMS.  Fix that and you won't get
> > any more bug reports about cache corruption problems, since the user
> > will be in control of their cache.
> Actually it's called "Pragma: no-cache", and Netscape has always sent this
> for reloads.

Roy's point is that Netscape also sends IMS along with *all* cached requests.
That's what's causing so many Netscape caches to get stuck with junk
which the user cannot refresh, and the only solution is to clear your
entire Netscape cache.

"Pragma: no-cache" is not aimed at end servers (only proxies in between),
so the end servers are always asked to respond "304 Not Modified".

As Roy says, fix that and most of the problems will go away.

Received on Tuesday, 15 August 1995 13:13:18 UTC

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