/**
 * Implements hook_page_delivery_callback_alter().
 */
function {{ machine_name }}_page_delivery_callback_alter(&$callback) {
  // jQuery sets a HTTP_X_REQUESTED_WITH header of 'XMLHttpRequest'.
  // If a page would normally be delivered as an html page, and it is called
  // from jQuery, deliver it instead as an Ajax response.
  if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' && $callback == 'drupal_deliver_html_page') {
    $callback = 'ajax_deliver';
  }
}