Because every request is routed through it, the front controller can be

used to perform global initializations prior to setting up the kernel or

to*`decorate`_* the kernel with additional features. Examples include:

to `decorate`_ the kernel with additional features. Examples include:

* Configuring the autoloader or adding additional autoloading mechanisms;

* Adding HTTP level caching by wrapping the kernel with an instance of

:ref:`AppCache<symfony-gateway-cache>`;

* Enabling (or skipping) the:doc:`ClassCache</cookbook/debugging>`

* Enabling the:doc:`/components/debug`.

The front controller can be chosen by requesting URLs like: