Symfony2 - Manipulate request/response from the Kernel Exception Listener

Question

I am building an administration panel for a website and I would like to change the view called when a 404 exception occurs but only for the admin application. <

Answer 1

You could try this one:

public function __construct(TwigEngine $templating)
{
    $this->templating = $templating;
}

public function onKernelException(GetResponseForExceptionEvent $event)
{
    static $handling;

    $exception = $event->getException();

    if (true === $handling) {
        return;
    }
    $handling = true;

    $code = $exception->getCode();

    if (0 !== strpos($event->getRequest()->getPathInfo(), '/admin') && 404 === $code) {
        $message = $this->templating->render('AcmeBundle:Default:error404new.html.twig', array());
        $response = new Response($message, $code);
        $event->setResponse($response);
    }

    $handling = false;
}

$templating variable can be passed in services.xml: