function ToolbarController::subtreesAjax

Returns an AJAX response to render the toolbar subtrees.

Return value

\Drupal\Core\Ajax\AjaxResponse

File

core/modules/toolbar/src/Controller/ToolbarController.php, line 24

Class

ToolbarController

Defines a controller for the toolbar module.

Namespace

Code

public function subtreesAjax() {
    [
        $subtrees,
    ] = 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;
}