When using a controller defined as a service, you can still extend any of the

:ref:`normal base controller <the-base-controller-class-services>` classes and

use their shortcuts. But, you don't need to! You can choose to extend *nothing*,

The base `Controller class source code`_ is a great way to see how to accomplish

common tasks. For example, ``$this->render()`` is usually used to render a Twig