authentication extensions.
* $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
Regular web request transactions that takes longer than this are aborted.
+* Added a new hook, 'TitleMoveCompleting', which runs before a page move is committed.
+* $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
+ from CDN to mitigate DB replication lag and WAN cache purge lag.
=== External library changes in 1.27 ===
==== Upgraded external libraries ====
the text before diffing it.
* Deprecated formats dbg, txt, and yaml have been removed.
* (T47988) The protect log event details now use new-style formatting.
+* The following response properties from action=login are deprecated, and may
+ be removed in the future: lgtoken, cookieprefix, sessionid. Clients should
+ handle cookies to properly manage session state.
=== Action API internal changes in 1.27 ===
* ApiQueryORM removed.
* wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly instead.
* Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
+* Removed msg_resource_links database table and associated code.
+* Removed msg_resource database table and associated code.
+* Skin::getNamespaceNotice() was removed.
+* wfIsConfiguredProxy() was removed (deprecated since 1.24).
+* wfDebugTimer() was removed (deprecated since 1.25).
+* wfIsTrustedProxy() was removed (deprecated since 1.24).
+* wfGetIP() was removed (deprecated since 1.19).
+* MWHookException was removed.
== Compatibility ==