Symfony\Component\HttpKernel\KernelEvents

The REQUEST event occurs at the very beginning of request dispatching

This event allows you to create a response for a request before any
other code in the framework is executed. The event listener method
receives a Symfony\Component\HttpKernel\Event\GetResponseEvent
instance.

The EXCEPTION event occurs when an uncaught exception appears

This event allows you to create a response for a thrown exception or
to modify the thrown exception. The event listener method receives
a Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent
instance.

The VIEW event occurs when the return value of a controller is not a Response instance

This event allows you to create a response for the return value of the
controller. The event listener method receives a
Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent
instance.

The CONTROLLER event occurs once a controller was found for handling a request

This event allows you to change the controller that will handle the
request. The event listener method receives a
Symfony\Component\HttpKernel\Event\FilterControllerEvent instance.

The RESPONSE event occurs once a response was created for replying to a request

This event allows you to modify or replace the response that will be
replied. The event listener method receives a
Symfony\Component\HttpKernel\Event\FilterResponseEvent instance.

The TERMINATE event occurs once a response was sent

This event allows you to run expensive post-response jobs.
The event listener method receives a
Symfony\Component\HttpKernel\Event\PostResponseEvent instance.