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    <h3>Editing: RouterDataCollector.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpKernel\DataCollector;

use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\ControllerEvent;

/**
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
class RouterDataCollector extends DataCollector
{
    /**
     * @var \SplObjectStorage&lt;Request, callable&gt;
     */
    protected $controllers;

    public function __construct()
    {
        $this-&gt;reset();
    }

    /**
     * {@inheritdoc}
     *
     * @final
     */
    public function collect(Request $request, Response $response, ?\Throwable $exception = null)
    {
        if ($response instanceof RedirectResponse) {
            $this-&gt;data['redirect'] = true;
            $this-&gt;data['url'] = $response-&gt;getTargetUrl();

            if ($this-&gt;controllers-&gt;contains($request)) {
                $this-&gt;data['route'] = $this-&gt;guessRoute($request, $this-&gt;controllers[$request]);
            }
        }

        unset($this-&gt;controllers[$request]);
    }

    public function reset()
    {
        $this-&gt;controllers = new \SplObjectStorage();

        $this-&gt;data = [
            'redirect' =&gt; false,
            'url' =&gt; null,
            'route' =&gt; null,
        ];
    }

    protected function guessRoute(Request $request, $controller)
    {
        return 'n/a';
    }

    /**
     * Remembers the controller associated to each request.
     */
    public function onKernelController(ControllerEvent $event)
    {
        $this-&gt;controllers[$event-&gt;getRequest()] = $event-&gt;getController();
    }

    /**
     * @return bool Whether this request will result in a redirect
     */
    public function getRedirect()
    {
        return $this-&gt;data['redirect'];
    }

    /**
     * @return string|null
     */
    public function getTargetUrl()
    {
        return $this-&gt;data['url'];
    }

    /**
     * @return string|null
     */
    public function getTargetRoute()
    {
        return $this-&gt;data['route'];
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'router';
    }
}
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