Manual:$wgHTCPMulticastAddress

This feature was removed from MediaWiki core in version 1.24.0. Please see $wgHTCPRouting for an alternative way to use this feature.

HTCP multicast purging: $wgHTCPMulticastAddress
What address to send udp HTCP purge packets if being used
Introduced in version:	1.4.1
Removed in version:	1.24.0 (Gerrit change 150761; git #0eed71b7)
Allowed values:	(IP address)
Default value:	`false` (1.9-1.23) `"224.0.0.85"` (1.4.1-1.8)
Other settings: Alphabetical \| By function

Details

Deprecated. Setting first appeared in 1.4.1, but was commented out in DefaultSettings.php . Set to false from 1.9.0. Replaced by $wgHTCPMulticastRouting in MediaWiki 1.20 and $wgHTCPRouting in MediaWiki 1.22 and subsequent versions.

HTCP is a method of purging entries from the Squid cache that can use multicast and udp which is faster then opening an http connection to every squid server.

The $wgHTCPMulticastAddress variable is deprecated as of MediaWiki 1.20.0 but is still recognized by being copied to the new one in includes/Setup.php :

// <translate nowrap><!--T:12--> $wgHTCPMulticastRouting got renamed to $wgHTCPRouting in MediaWiki 1.22</translate>
// <translate nowrap><!--T:16--> ensure back compatibility.</translate>
if ( !$wgHTCPRouting && $wgHTCPMulticastRouting ) {
        $wgHTCPRouting = $wgHTCPMulticastRouting;
}

// <translate nowrap><!--T:13--> Initialize $wgHTCPRouting from backwards-compatible settings that comes from pre 1.20 version.</translate>
if ( !$wgHTCPRouting && $wgHTCPMulticastAddress ) {
        $wgHTCPRouting = array(
                '' => array(
                        'host' => $wgHTCPMulticastAddress,
                        'port' => $wgHTCPPort,
                )
        );
}

Details

See also