ToolbarController::subtreesAjax

public ToolbarController::subtreesAjax()

public function subtreesAjax() {
  list($subtrees, $cacheability) = toolbar_get_rendered_subtrees();
  $response = new AjaxResponse();
  $response->addCommand(new SetSubtreesCommand($subtrees));

  // The Expires HTTP header is the heart of the client-side HTTP caching. The
  // additional server-side page cache only takes effect when the client
  // accesses the callback URL again (e.g., after clearing the browser cache
  // or when force-reloading a Drupal page).
  $max_age = 365 * 24 * 60 * 60;
  $response->setPrivate();
  $response->setMaxAge($max_age);

  $expires = new \DateTime();
  $expires->setTimestamp(REQUEST_TIME + $max_age);
  $response->setExpires($expires);

  return $response;
}