Manual:$wgEnableCanonicalServerLink

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Output: $wgEnableCanonicalServerLink
Output a `<link rel="canonical">` tag on every page indicating the canonical server which should be used, i.e. `$wgServer` or `$wgCanonicalServer` .
Introduced in version:	1.21.0 (Gerrit change 41562; git #e0a78d0a)
Removed in version:	Still in use
Allowed values:	(boolean)
Default value:	`false`
Other settings: Alphabetical \| By function

Details

If enabled with "true", output a <link rel="canonical"> tag on every page, indicating the canonical URL of the page. The URL includes the canonical server which should be used, i.e. $wgServer or $wgCanonicalServer .