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From mediawiki.org
HTTP proxy (CDN) settings: $wgCdnMatchParameterOrder
Indicates if should take query parameters order on incoming requests into account for CDN caching
Introduced in version:1.39.0 (Gerrit change 820905; git #a8717756)
Removed in version:still in use
Allowed values:(boolean)
Default value:true


Set this to false if MediaWiki is behind a CDN that re-orders query parameters on incoming requests. MediaWiki sets a large Cache-Control: s-maxage= directive on page views only if the request URL matches one of the normal CDN URL forms. When this setting is false, the matching algorithm ignores the order of URL parameters.