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Snippet from Setup:

if ( $wgCookieSecure === 'detect' ) {
	$wgCookieSecure = ( substr( $wgServer, 0, 6 ) === 'https:' );
}

Should probably use WebRequest::detectProtocol() instead.

https://gerrit.wikimedia.org/r/18627

WebRequest::detectProtocol() returns the string 'https' (without a colon).