rest_pre_serve_request filter-hook . WP 4.4.0

Filters whether the request has already been served.

Allow sending the request manually - by returning true, the API result will not be sent to the client.

Usage

add_filter( 'rest_pre_serve_request', 'filter_function_name_5314', 10, 4 );
function filter_function_name_5314( $served, $result, $request, $this ){
	// filter...

	return $served;
}

$served(true/false)

Whether the request has already been served.
Default: false

$result(WP_HTTP_Response)

Result to send to the client. Usually a WP_REST_Response.

$request(WP_REST_Request)

Request used to generate the response.

$this(WP_REST_Server)

Server instance.

Where the hook is called

$served = apply_filters( 'rest_pre_serve_request', false, $result, $request, $this );

Where the hook is used (in WP core)

add_filter( 'rest_pre_serve_request', '_oembed_rest_pre_serve_request', 10, 4 );

add_filter( 'rest_pre_serve_request', 'rest_send_cors_headers' );