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From Bryan McQuade <bmcqu...@google.com>
Subject mod_deflate and vary accept-encoding
Date Fri, 13 Aug 2010 18:25:06 GMT
Hi,

In looking at the source for mod_deflate:

http://www.google.com/codesearch/p?hl=en#lfs-jRjrQ3s/trunk/modules/filters/mod_deflate.c&l=524

It appears to insert Vary Accept-Encoding header into every candidate
response by default, which is what you would expect.

But the instructions here: http://httpd.apache.org/docs/2.0/mod/mod_deflate.html

suggest adding a line to manually add Vary Accept-Encoding to responses:
# Make sure proxies don't deliver the wrong content
Header append Vary User-Agent env=!dont-vary

Is this "Header append Vary User-Agent env=!dont-vary" necessary or
does mod_deflate now add the Vary Accept-Encoding header by default?

Thanks,
Bryan

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