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From Eric Covener <>
Subject Re: Vary:User-Agent, best practices, and making the web faster.
Date Sat, 04 Jun 2011 20:14:58 GMT
> This encourages all site owners to add Vary:User-Agent to all css and js
> files, whether they actually vary in content or not.
> Does anyone know the history of this recommendation?  Surely that is an
> inappropriate recommendation for mod_deflate.  Vary:Accept-Encoding make
> sense in the context of that filter, but not Vary:User-Agent.

It's because of the other (dated) canned exceptions that set/unset
no-gzip/gzip-only-text/html based on the User-Agent, to second-guess
browsers that send AE:gzip but can't properly deal with it.

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