MediaWiki:Apihelp-query+exturlusage-param-protocol
From M&J Cactus Wiki
Protocol of the URL. If empty and $1query is set, the protocol is http and https. Leave both this and $1query empty to list all external links.
Protocol of the URL. If empty and $1query is set, the protocol is http and https. Leave both this and $1query empty to list all external links.
