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From Ralph Goers <>
Subject Re: "Vary: Host" in ResourceReader breaks IE
Date Mon, 12 Sep 2005 17:42:39 GMT
Did you see

Sylvain Wallez wrote:

> Hi all,
> I found an annoying thing today. The following straightforward sitemap 
> statement, which is intended to download a zip file, leads IE to 
> display an error message when the users tries to open Winzip from IE 
> (saving the file on disk is ok):
>    <map:read src="" mime-type="application/x-zip-compressed"/>
> After some protocol-level debugging, it appears to be caused by the 
> "Vary: Host" header that is added by the ResourceReader, which leads 
> to an error message in IE. This bug has been identified in 1999 [1]!!!
> Now it seems that this header was added to work around an IE cache bug 
> [2] about which no details are given.
> So the fix to the unknown cache problem leads to falling into another 
> IE bug. Can someone explain the reason for the Vary header? If not, 
> I'd like to remove it so that downloads work again...
> Sylvain
> [1]
> [2]

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