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From Joshua Slive <>
Subject Re: mod_deflate and no-gzip
Date Wed, 18 Aug 2004 14:40:31 GMT

On Wed, 18 Aug 2004, Brian Akins wrote:

> Shouldn't we still set "Vary: Accept-Encoding" if no-gzip is set?  Example, 
> if I use SetEnvIf to disallow gzip for some browsers, shouldn't we still tell 
> proxies to vary on "Accept-Encoding"?  mod_deflate will send the Vary if the 
> client does not have a proper Accept-Encoding header, but not if we set 
> no-gzip.  THis seems broken.  If mod_deflate is called, if should send a 
> Vary.

What about
SetEnvIf Request_URI file[0-9]+\.html no-gzip

This doesn't require a Vary-header.  And in fact, the example you site 
requires a "Vary: User-Agent", not "Vary: Accept-Encoding".

This is a rather difficult problem, and I don't have a good solution to 
propose.  Currently, it is the responsibility of the admin to deal with 
Vary if they use no-gzip.  For an example, see
and for a discussion:


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