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List:       kfm-devel
Subject:    Bug#23382: marked as done (reload on a page returning different mimetype) by David Faure <david@mand
From:       owner () bugs ! kde ! org (Stephan Kulow)
Date:       2001-03-31 10:03:08
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Your message dated Sat, 31 Mar 2001 10:55:22 +0100
with message-id <200103310955.f2V9tNI02797@faure.worldonline.co.uk>
and subject line Bug#23382: reload on a page returning different mimetype
has caused the attached bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what I'm
talking about this indicates a serious mail system misconfiguration
somewhere.  Please contact me immediately.)

Stephan Kulow
(administrator, KDE bugs database)

Received: (at submit) by bugs.kde.org; 31 Mar 2001 02:50:57 +0000
Received: (qmail 20802 invoked by uid 33); 31 Mar 2001 02:50:57 -0000
Date: 31 Mar 2001 02:50:57 -0000
Message-ID: <20010331025057.20801.qmail@master.kde.org>
To: submit@bugs.kde.org
Subject: reload on a page returning different mimetype
From: leonb@research.att.com

Package:           khtml
Version:           3.0 (using KDE 2.1.9 >= 20010310)
Severity:          normal
Installed from:    compiled sources
Compiler:          gcc version 2.96 20000731 (Red Hat Linux 7.0)
OS:                Linux 2.4.2 i686
OS/Compiler notes: 


Go to the following page:
http://djvuserver.research.att.com/~leonb/test/fun.cgi
This cgi script randomly returns either
a gif image or a html page showing
the text of the script.

The first time, you might see the html
or the gif image.  Nevertheless, keep
pressing the RELOAD button until this 
changes.  

PROBLEM: konqueror does not realize that
the mimetype is changed and that it
should activate a different part.

Therefore if you get the html the first time,
you see garbage when it is time to see the
image.  And conversely!

In the case of KHTML, this is happening
in the last lines of  urlSelected(), where
the part calls its own openURL function
instead of going back to the browser
openURLRequest function.

But this is also happening with kview,
as you can see when you get the GIF
the first time. 

I have seen this bug on CGI scripts that 
provide feedback to the user using a 
meta refresh (similar to a reload).  
It took me quite a while to produce 
a usable case ...

One cannot assume that a reload
will always produce the same mimetype.

Especially when the response explicitely
says that the data cannot be cached
(Cache-Control: no-cache).

Disgression: Legacy browsers :) always
disable caching when the URL contains
stuff like  "/cgi-bin/" or  ".cgi?..." or
finish with ".cgi".  This is of course
extremly ad-hoc, but many scripts around
rely on this behavior...

Leon Bottou.


(Submitted via bugs.kde.org)
(Called from KBugReport dialog)

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