Как правильно сгенерировать robots.txt в symfony 4?

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// src/Controller/RobotsController.php
namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationResponse;

class RobotsController extends AbstractController
{
    public function index(): Response
    {
        $content = "User-agent: *
Disallow: /";

        return new Response($content, 200, [
            'Content-Type' => 'text/plain',
        ]);
    }
}

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# config/routes.yaml
robotstxt:
    path: /robots.txt
    controller: AppControllerRobotsController::index