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Re: jigsaw, Microsoft internet explorer and images

From: Yves Lafon <ylafon@w3.org>
Date: Wed, 28 Oct 1998 10:05:58 +0100 (MET)
To: Christopher William Turner <cwturner@cycom.co.uk>
cc: Francesco Coda <coda@cefriel.it>, www-jigsaw@w3.org
Message-ID: <Pine.GSO.4.05.9810281001350.27298-100000@tarantula.inria.fr>
On Tue, 27 Oct 1998, Christopher William Turner wrote:

> Francesco Coda wrote:
> > I am running jigsaw 2.0 beta3 on a PC with Windows NT 4.
> > I have problems when I browse the site served by jigsaw with Microsoft
> > internet explorer 4.0.
> I reproduced this and I suspected a thread lock, after many hours debugging I
> foundthat the problem has nothing to do with the jigsaw server!
> IE4.0 cannot display the gif format used for the images on the jigsaw
> demo pages even when directly loaded via the file: protocol.

I tested with IE5. For jigsaw.gif (but it is the same with w3c_home.png)
The first request get the icons, and if you want to go back to a page with
this icon, you end up with this kind of request:

GET /icons/jigsaw HTTP/1.1
Date: Wed, 28 Oct 1998 09:02:37 GMT
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en-us
Host: www45.inria.fr:8007
If-None-Match: "1cnc3ld:pup4j67g"
Referer: http://www45.inria.fr:8007/Doc/
User-Agent: Mozilla/4.0 (compatible; MSIE 5.0b1; Windows NT)

Of course, the If-None-Match clause is used and Jigsaw replies:

HTTP/1.1 304 Not Modified
Cache-Control: max-age=518400
Date: Wed, 28 Oct 1998 08:59:47 GMT
Content-Location: http://www45.inria.fr:8007/icons/jigsaw.gif
Etag: "1cnc3ld:pup4j67g"
Expires: Tue, 03 Nov 1998 08:59:47 GMT
Server: Jigsaw/2.0beta1
Vary: Accept,Accept-Charset,Accept-Language,Accept-Encoding

As it is a 304, the browser should use the version it has in its cache (it
should have on as it asked for a revalidation). But... the icon is not
shown (broken). Definitely an IE bug! (I did not test that with ie4.0)

      /\          - Yves Lafon - World Wide Web Consortium - 
  /\ /  \        Architecture Domain - Jigsaw Activity Leader
 /  \    \/\    
/    \   /  \   http://www.w3.org/People/Lafon - ylafon@w3.org    
Received on Wednesday, 28 October 1998 04:07:30 UTC

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