[Mod_gzip] [ANNOUNCEMENT] mod_gzip 1.3.26.1a

[Todd Vierling]

On Tue, 1 Oct 2002, Christian Kruse wrote:

: * Vary bugfix

:   But now this is not longer necessary. mod_gzip sends no
:   Vary headers when the request is excluded by 'file', 'uri' or
:   'handler'.

This still isn't quite right.

It shouldn't send Vary on anything which is not *included* (i.e. "it
shouldn't be necessary to exclude something explicitly if mod_gzip won't
touch it based on include directives").  My config, for instance, is quite
simple and succinct about what it allows to be gzipped:

    mod_gzip_item_include mime ^httpd/unix-directory
    mod_gzip_item_include mime ^text/
    mod_gzip_item_exclude file \.css$
    mod_gzip_item_exclude file \.js$

You'll note that this set doesn't include any "image/" MIME types, nor any
"application/" MIME types, and indeed, these files types are never
compressed.  Yet I'm still getting "Vary:" headers on these if I don't
explicitly turn them off.

Also, the note above says nothing at all about matching on MIME types.
Testing indicates that

    mod_gzip_item_exclude mime ^image/
    mod_gzip_item_exclude mime ^application/

does not, in fact, turn off the Vary: headers.

So there's still some work to be done on making the Vary: generation
smarter.  8-)

-- 
-- Todd Vierling <tv@pobox.com>