function wp_is_jsonp_request() {
  if ( ! isset( $_GET['_jsonp'] ) ) {
    return false;
  }

  if ( ! function_exists( 'wp_check_jsonp_callback' ) ) {
    require_once ABSPATH . WPINC . '/functions.php';
  }

  $jsonp_callback = $_GET['_jsonp'];
  if ( ! wp_check_jsonp_callback( $jsonp_callback ) ) {
    return false;
  }

  
/** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
  $jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true );

  return $jsonp_enabled;
}