public function execute(
        UrlChain $urlChain,
        RendererInterface $renderer,
        OutputInterface $output
    ) {
        $result = 0;

        foreach ($urlChain->getUrls() as $url) {
            $result = $result | $this->executeUrl(
                    $this->client,
                    $url,
                    $renderer,
                    $output
                );
        }

        return $result;
    }