https://bugzilla.wikimedia.org/show_bug.cgi?id=19849
Summary: X-Vary-Options header should be configurable, not sent
to users
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: minor
Priority: Normal
Component: Page rendering
AssignedTo: wikibugs-l@lists.wikimedia.org
ReportedBy: greenrea...@hotmail.com
MediaWiki sends a custom X-Vary-Options header on responses. The reason for
doing so is described here:
http://www.mail-archive.com/squid-...@squid-cache.org/msg07066.html
An example:
X-Vary-Options:
Accept-Encoding;list-contains=gzip,Cookie;string-contains=ruToken;string-contains=ruLoggedOut;string-contains=ru_session\r\n
This header helps patched caches. However for those sites which don't have that
patch applied, or who don't use Squid at all - i.e. pretty much everyone
outside Wikimedia - this feature just adds around 137 uncompressed bytes of
useless padding per request.
This header should be optional, and off by default, unless/until this patch is
accepted upstream in Squid.
FWIW, I also feel this header should also be stripped out from Wikimedia
responses going to end-users (==if there is no Via: header in the request),
otherwise you're needlessly sending them ~260 uncompressed bytes per request:
X-Vary-Options:
Accept-Encoding;list-contains=gzip,Cookie;string-contains=enwikiToken;string-contains=enwikiLoggedOut;string-contains=enwiki_session;string-contains=centralauth_Token;string-contains=centralauth_Session;string-contains=centralauth_LoggedOut
This would presumably involve changing the Squid patch itself.
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