Thanks for all replies.
I thought then the primary problem is IE6 with http/1.0 can't accept
the Vary: header.
I don't know why, but this really happened on all our ie6 browsers.
Our users have also reported this case.
Maybe it's an IE's bug? ie7/firefox don't have this problem.

Thanks.

//joy


On Fri, Feb 29, 2008 at 8:37 PM, Eric Covener <[EMAIL PROTECTED]> wrote:
> On Fri, Feb 29, 2008 at 4:24 AM, J. Peng <[EMAIL PROTECTED]> wrote:
>  > On Fri, Feb 29, 2008 at 5:14 PM, Matus UHLAR - fantomas
>  >  <[EMAIL PROTECTED]> wrote:
>  >  > On 29.02.08 11:44, J. Peng wrote:
>  >  >  > I talk nothing about cache.
>  >  >  > if mod_deflate didn't compress a file, why it still send a Vary 
> header?
>  >  >  > This is what I'm always talking about.
>  >  >
>  >  >  you were advised to read HTTP specificationm (rfc 2616), did you?
>  >  >
>  >
>  >  Hmm! did you see my questions again?
>  >  I was saying if mod_deflate didn't compress a file, it shouldn't send
>  >  a Vary header.
>  >  Don't tell me the so called standard, why mod_deflate always send a
>  >  Vary header when it doesn't compress that file?
>
>  Because the response to requests for this same resource can change
>  based on the incoming Accept-Encoding header, and the Vary header is
>  the way this is communicated.
>
>  It's like flipping a coin and deciding the result doesn't vary when it
>  comes up "heads", but it does vary when it comes up "tails"
>
>
>  --
>  Eric Covener
>  [EMAIL PROTECTED]
>
>
>
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