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This page is obsolete. It is kept for historical interest only. It may document extensions or features that are obsolete and/or no longer supported. Do not rely on the information here being up-to-date.
This page is archived! Find up-to-date documentation at https://wikitech.wikimedia.org/wiki/Analytics
The X-CS HTTP header is used by analytics for tracking data for later analysis. It is made up of serialized key/value pairs.
- mf-m: MobileFrontend mode, eg when a user is using the stable, beta, or alpha version of the mobile site
- Possible values: 'b' (beta), 'a' (alpha). NB that when a user is in the 'stable' mode, there is no key/value set.
- zero: A short code set by ZeroRatedMobileAccess