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apply_filters( 'rest_pre_serve_request', bool $served, WP_HTTP_Response $result, WP_REST_Request $request, WP_REST_Server $this )

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.

$served: (bool) 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.

Used By	Description
wp-includes/rest-api/class-wp-rest-server.php: WP_REST_Server::serve_request()	Handles serving an API request.

Version	Description
4.4.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/rest_pre_serve_request