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Re: IE 5.0 stylesheet caching bug

From: Roy T. Fielding <fielding@kiwi.ICS.UCI.EDU>
Date: Tue, 28 Dec 1999 14:59:06 -0500 (EST)
To: Dan Kohn <dan@teledesic.com>
cc: "'fahrner@pobox.com'" <fahrner@pobox.com>, "Fork (E-mail)" <fork@kragen.dnaco.net>, "'www-style@w3.org'" <www-style@w3.org>
Message-ID: <199912281158.aa03360@gremlin-relay.ics.uci.edu>
>IE refetches the stylesheet.  Now, choose File: Work Offline and hit back.
>Note that the page is displayed without the stylesheet because it's not
>cached.

That is because the URL being used for the stylesheet is negotiated,
which results in a Vary header field being returned by Apache, which
for some incredibly stupid reason MSIE refuses to cache even though
its user agent is based on a non-shared cache.

   GET http://www.w3.org/StyleSheets/Core/Steely HTTP/1.0
   Accept: */*
   User-Agent: GET/0.6 libwww-perl/0.50
   Host: www.w3.org
   
   HTTP/1.1 200 OK
   Date: Tue, 28 Dec 1999 18:47:00 GMT
   Server: Apache/1.3.6 (Unix) PHP/3.0.11
   Content-Location: Steely.css
   Vary: negotiate
   TCN: choice
   Connection: close
   Content-Type: text/css

The workaround is just to use the filename extension on the URL ".css"
and avoid the negotiation code altogether.  Since the usage is unable
to handle anything but CSS, not using the extension doesn't improve
the longevity of this reference.

....Roy
Received on Saturday, 1 January 2000 15:41:53 GMT

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