_oembed_rest_pre_serve_request( bool $served, WP_HTTP_Response $result, WP_REST_Request $request, WP_REST_Server $server ): bool

786function _oembed_rest_pre_serve_request( $served, $result, $request, $server ) {787	$params = $request->get_params();788 789	if ( '/oembed/1.0/embed' !== $request->get_route() || 'GET' !== $request->get_method() ) {790		return $served;791	}792 793	if ( ! isset( $params['format'] ) || 'xml' !== $params['format'] ) {794		return $served;795	}796 797	// Embed links inside the request.798	$data = $server->response_to_data( $result, false );799 800	if ( ! class_exists( 'SimpleXMLElement' ) ) {801		status_header( 501 );802		die( get_status_header_desc( 501 ) );803	}804 805	$result = _oembed_create_xml( $data );806 807	// Bail if there's no XML.808	if ( ! $result ) {809		status_header( 501 );810		die( get_status_header_desc( 501 ) );811	}812 813	if ( ! headers_sent() ) {814		$server->send_header( 'Content-Type', 'text/xml; charset=' . get_option( 'blog_charset' ) );815	}816 817	echo $result;818 819	return true;820}