production.
=== Configuration changes in 1.28 ===
+* BREAKING CHANGE: $wgHTTPProxy is now *required* for all external requests
+ made by MediaWiki via a proxy. Relying on the http_proxy environment
+ variable is no longer supported.
* The load.php entry point now enforces the existing policy of not allowing
access to session data, which includes the session user and the session
user's language. If such access is attempted, an exception will be thrown.