private function getReferer($url, $httpHeader = [])
    {
        $default_referer = $this->config['default_referer'];

        if (!empty($httpHeader['referer'])) {
            $this->logger->info('Found referer "{referer}" for url "{url}" from site config', ['referer' => $httpHeader['referer'], 'url' => $url]);

            return $httpHeader['referer'];
        }

        $this->logger->info('Use default referer "{referer}" for url "{url}"', ['referer' => $default_referer, 'url' => $url]);

        return $default_referer;
    }