StaticSiteListener.php

<?php
/**
 * @author Manuele Menozzi <[email protected]>
 */

namespace Acme\DemoBundle\EventListener;


use Symfony\Component\HttpFoundation\BinaryFileResponse;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\HttpKernel;

class StaticSiteListener
{
    public function onKernelRequest(GetResponseEvent $event)
    {
        if (HttpKernel::MASTER_REQUEST != $event->getRequestType()) {
            // non fare niente se non si è nella richiesta principale
            return;
        }

        $rootDir = "/tmp/sf2/app";
        $requestUri = $event->getRequest()->getRequestUri();
        if ($requestUri == '/') {
            $requestUri = '/index.php';
        }

        $includeFile = "$rootDir/../web/webgriffe-v10$requestUri";

        if (!file_exists($includeFile) || !is_file($includeFile)) {
            return;
        }

        if (substr_compare($includeFile, '.php', -4) === 0) {
            ob_start();
            include $includeFile;
            $responseContent = ob_get_contents();
            ob_end_clean();
            $event->setResponse(new Response($responseContent));
            return;
        }

        $binaryFileResponse = new BinaryFileResponse($includeFile);

        if (substr_compare($includeFile, '.css', -4) === 0) {
            $binaryFileResponse->headers->set('Content-Type', 'text/css');
        }
        if (substr_compare($includeFile, '.js', -3) === 0) {
            $binaryFileResponse->headers->set('Content-Type', 'text/javascript');
        }

        $event->setResponse($binaryFileResponse);
    }

    public function getBaseUrl()
    {
        return 'http://localhost:8000/';
    }
} 

Occhio alla priority!

<service id="acme.static_site.listener" class="Acme\DemoBundle\EventListener\StaticSiteListener">
        <tag name="kernel.event_listener" event="kernel.request" method="onKernelRequest" priority="255" />
</service>