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From Apache Wiki <>
Subject [Cocoon Wiki] Update of "ControllingModCache" by LaurentPerez
Date Fri, 10 Feb 2006 13:52:33 GMT
Dear Wiki user,

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The following page has been changed by LaurentPerez:

+ == Update regarding mod_cache under Apache httpd 2.2.x ==
+ The mod_cache bundled with versions 2.0.x of Apache httpd does not work fine with the "Vary:"
header : when you set this header, mod_cache will detect it but will simply regenerate over
and over again the cached content, resulting in zero cache efficiency.
+ The bug has been corrected in branch 2.2 of Apache, with version 2.2.0 being labeled as
the new stable one (as of January 2006). However, a severe regression bug was also introduced
when using mod_cache in connection with mod_proxy ! The bugzilla entry is at
and the 2.2.0 patch is available at
+ So if you want to cache content responses based on http headers variations thanks to "Vary:",
you have to run Cocoon under Apache 2.2 with this bugzilla patch. Happy caching :)

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