On 30/12/11 14:50, Forest ForTrees wrote:
Varnish uses scripts in a remarkably flexible
(called VCL) to determine which files to cache and which to pass to
Apache. In particular, it can use PCRE based regexes on http
headers to determine how to handle a request. For example, it
should be able to look for session, UserID or Token cookies from
MediaWiki. If it finds one of these, then it could be configured to
pass the request to Apache rather than looking in the cache.
However, if those cookies aren't set and the requested resource is
in the MediaWiki folder (i.e. the folder in $wgScriptPath), then it
could conceivably look for the object in the cache rather than
contacting Apache, even if other cookies, such as the Google
Analytics or Vector cookies, are set. If the requested resource is
in another folder, dif ferent behavior could apply.
MediaWiki can send a header called X-Vary-Options which gives you a
list of header substrings to vary the cache on. It is specific to
A VCL routine which parses this header and uses it to make caching
decisions would solve your problem and, if published, would also be
useful to other sites using Varnish with MediaWiki.
-- Tim Starling