..tip::

You can extend either ``Controller`` or ``AbstractController``. The difference

is that when you extend ``AbstractController``, you can't access services directly

via ``$this->get()`` or ``$this->container->get()``. This forces you to write

more robust code to access services. But if you *do* need direct access to the

container, using ``Controller`` is fine.

is that when you extend ``AbstractController``, you can't access to your services

via ``$this->get()`` or ``$this->container->get()``, only to a set of common

Symfony services. This forces you to write more robust code to access services.

Moreover, in Symfony 4.2 ``Controller`` was deprecated in favor of

``AbstractController``, so using the latter will make your apps future-proof.

..versionadded::3.3

The ``AbstractController`` class was added in Symfony 3.3.