https://bugzilla.wikimedia.org/show_bug.cgi?id=57280
Web browser: ---
Bug ID: 57280
Summary: Wikipedia Zero X-Forwarded-By, Cache Variance
Optimizations
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: Unprioritized
Component: ZeroRatedMobileAccess
Assignee: wikibugs-l@lists.wikimedia.org
Reporter: ab...@wikimedia.org
CC: mgro...@wikimedia.org
Classification: Unclassified
Mobile Platform: ---
The Wikipedia Zero Varnish configuration and MediaWiki extension modifies
webpages to have banners providing attribution to carriers for their
partnership on free data access for their subscribers. This technology also
rewrites hyperlinks to prompt users in case they're entering into an action
that could data charges. As this content is injected into server responses,
object cache variance is introduced. Injection of content solely through
JavaScript to prevent this sort of cache variance unfortunately wouldn't
suffice due to the lower end phones with poor JavaScript support.
The solution for major further reduction of cache-varied objects, as presented
at https://www.mediawiki.org/wiki/Requests_for_comment/Zero_Architecture,
relies on several things, king among them use of Edge Side Includes (ESI) for
banner serves. The code is mostly in place, but the ESI implementation is on
the back burner due to some tech and personnel constraints.
While the ESI implementation is stalled, a need has been uncovered to further
vary caches for things like source proxies - namely, the Opera Mini proxy. Some
carriers support the Opera Mini proxy for zero-rating and some do not. The
banners need to be served conformant with operator implementation.
The following change documents the case with Opera Mini (plus a "test) in
Varnish that is required. As requested in the change commentary, this bug is
being created for tracking purposes.
https://gerrit.wikimedia.org/r/#/c/88261/
Upon implementation of change 88261, the following change will be implemented
for the app servers
https://gerrit.wikimedia.org/r/#/c/95050/
TODOs on this bug:
0) Lightweight analysis of the relative object growth for each additional
source proxy (only Opera Mini is of consequence in the immediate near term;
presumably ESI will alleviate major issues prior to introduction of further
source proxies).
1) Implement ESI.
2) Centralize the X-Forwarded-By / Trusted X-Forwarded-For source IP addresses
in cooperation with the Platform team to avoid unnecessary duplication of
efforts.
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