HttpStatusCodePageVariant.php

<?php

class HttpStatusCodePageVariant {
  public function render() {
    $status_code = $this->configuration['status_code'];
    $dispatcher = \Drupal::service('event_dispatcher');
    $event = new PageManagerViewEvent();
    $event->setStatusCode($status_code);
    $dispatcher->dispatch(PageManagerEvents::VIEW, $event);
    return new Response($event->getContent(), $event->getStatusCode());
  }
}