+ * You can also pass an array of hosts to send purges too. This is useful when
+ * you have several multicast groups or unicast address that should receive a
+ * given purge. Multiple hosts support was introduced in MediaWiki 1.22.
+ *
+ * @par Example of sending purges to multiple hosts:
+ * @code
+ * $wgHTCPRouting = array(
+ * '' => array(
+ * // Purges to text caches using multicast
+ * array( 'host' => '239.128.0.114', 'port' => '4827' ),
+ * // Purges to a hardcoded list of caches
+ * array( 'host' => '10.88.66.1', 'port' => '4827' ),
+ * array( 'host' => '10.88.66.2', 'port' => '4827' ),
+ * array( 'host' => '10.88.66.3', 'port' => '4827' ),
+ * ),
+ * );
+ * @endcode
+ *
+ * @since 1.22
+ *
+ * $wgHTCPRouting replaces $wgHTCPMulticastRouting that was introduced in 1.20.
+ * For back compatibility purposes, whenever its array is empty
+ * $wgHTCPMutlicastRouting will be used as a fallback if it not null.