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Date: Sat, 4 Jun 2011 16:14:58 -0400
Message-ID: <BANLkTi=TfKWzXGTEbt39-t9ReQXtrTFgaQ@mail.gmail.com>
Subject: Re: Vary:User-Agent, best practices, and making the web faster.
From: Eric Covener <covener@gmail.com>
To: modules-dev@httpd.apache.org
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> 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? =A0Surely that is an
> inappropriate recommendation for mod_deflate. =A0Vary:Accept-Encoding mak=
e
> 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.