Last modified: 2014-11-17 10:36:09 UTC
See also bug 20814 comment 6
Note that wgCrossSiteAJAXdomains is already in MediaWiki since over a year, and was originally requested under bug 19907. This bug is about making it better and compatible with caching such as on WMF, so that we can enable it on Wikimedia sites as well (bug 20814) https://bugzilla.wikimedia.org/show_bug.cgi?id=19907#c13 and down talks about possible implementations with CORS and cache.
Fixed in https://gerrit.wikimedia.org/r/9624 (merged on Jul 5, 2012)