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X-Analytics is a general purpose header for measurement purposes, which is used in the Cache log format, and recorded in e.g. the webrequest table.


The X-Analytics header is a a list of zero or more key=value pairs, separated by semicolons. So for example mf-m=b, or zero=123-45;mf-m=b. If a key occurs multiple times in an X-Analytics header, it is undefined which one takes precedence.

The special value “-” has to be interpreted as the empty string.


Looks like X-Analytics extension might be adding these values if used: [1]

Also a "loggedIn" flag seems to be in x-analytics here and there. need to document those

Key Possible Values Who sets this value Use Case Team Contact Person
mf-m b or not set appserver If set, then the value b indicates that the user is opted into the beta mode (of the mobile site mf-m=b). See MobileContext.php. Readers Web User:Phuedx
php zend, or hhvm appserver If set, marks the used PHP implementation.

This tag was only set between September 2014 and January 2015 during the migration from Zend to HHVM. (See I46ff99, and I75b30b)

Ops _joe_
zero MCC-MNC of a zero carrier, e.g. 404‑01. varnish If set, indicates that this request has been associated with the given carrier. It does not mean that the request qualifies as page view.

This marker is only set for requests from the mobile varnishes (so no api, bits, upload, ...) and, at this time, only if carrier's whitelisting settings match this request, such as domain (EN is whitelisted, FR is not), HTTPS support (most carriers don't), Proxy (some carriers only whitelist if traffic is via Opera Mini proxy, some - only if direct, some allow both).

Wikipedia Zero User:Yurik
zeronet Subdivision of a carrier, e.g. b varnish Used of disambiguate between different parts/configurations of a single carrier. Like broadband vs. special access points. Wikipedia Zero User:Yurik
proxy Proxy name, e.g. Opera varnish If set, indicates that this request has been received via one of the trusted proxies such as Opera Mini servers.

Currently, the following proxies can be expected:

Value Description
Opera Opera mini proxy
Nokiaprod Nokia Xpress Production Proxy Servers
Nokiaqa Nokia Xpress QA Lab Proxy Servers
IORG Internet.org (set by analytics.inc.vcl in puppet)
Wikipedia Zero User:Yurik
https 1 varnish If set, will be equal to "1", and indicates HTTPS protocol. This value could be set for all mobile traffic and not just Zero (and hopefully one day - on all desktop traffic too) Wikipedia Zero & Mobile User:Yurik
wmfuuid unique value per installation, conforming to RFC 4122 version 4, spanning multiple requests varnish If set, will be equal to a hyphen separated value, and indicates a unique app installation. The ID is generated at app install time, using the appropriate library (Java, Objective C), and conforms to RFC 4122 version 4.

Older versions of the app may contain an appInstallID parameter in the request URL instead, or may contain both the appInstallID parameter in the URL as well as the wmfuuid X-Analytics value. Later versions of the software should only contain the wmfuuid X-Analytics value and not the appInstallID parameter in the URL.

Requests from the app will not contain this header if the user has turned off "Send usage reports" in the settings menu of the app.

Mobile apps ("Wikipedia" for Android app, "Wikipedia Mobile" for iOS app) User:dr0ptp4kt
WMF-Last-Access Date of site last access varnish If set will be equal to the latest date when a device issued a request to the specific host in dd-MMM-yyyy format(Eg: 06-May-2015) and an expiration date set to ~31 days in the future. More explanation at Analytics/Unique_clients/Last_access_solution. Analytics (Infrastructure) User:Milimetric or User:Madhuvishy
preview Whether this is a preview request (not present if not) client At the time of this writting preview requests by mobile apps are not consider pageviews.

Expected value is preview=1

Analytics (Infrastructure) User:Milimetric or User:Nuria
pageview Whether this request should be counted towards pageviews metric client If set it will count the request in question as a pageview regardless of other attributes of request. Analytics (Infrastructure) User:Milimetric or User:Nuria
nocookies Whether this is a request that came in without any cookies. varnish If set it will tag the request in question as a nocookie request. This means that either this is a fresh browser session, a user browsing with cookies disabled or possibly a bot request.

We expect that the majority of requests tagged with nocookies will belong to bots. Please see: https://gerrit.wikimedia.org/r/#/c/244626/

Analytics (Infrastructure) User:Madhuvishy or User:Nuria
loggedIn 1 WikimediaEvents extension If set, will be equal to "1", and indicates that the request came from a logged in user. WMDE-Analytics User:Addshore
page_id The page ID WikimediaEvents extension If set, will be a string of a positive integer. Ori & WMDE-Analytics User:Addshore & User:Ori.livneh
ns The namespace ID WikimediaEvents extension If set, will be a string integer (can be negative for negative namespace IDs) Ori & WMDE-Analytics User:Addshore & User:Ori.livneh
special String, resolved special page name WikimediaEvents extension Set for special pages only. This will be the base name of the special page, so if the user is browsing a page via an alias the actual page name will be here. WMDE-Analytics User:Addshore



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