public function render()
    {
        $this->prepare();

        $view = $this->twig->render(sprintf('%s.twig.html', $this->format), ['feed' => $this]);

        return Response::create(
            $view,
            200,
            [
                'Content-Type' => "{$this->getContentType()}; charset={$this->charset}",
            ]
        );
    }