protected function getPrefix($locale)
    {
        foreach ($this->localeResolver->getDomainConfig() as $_domain => $_locale) {
            if ($_locale === $locale) {
                $urlPrefix = sprintf('%s://%s', $this->request ? $this->request->getScheme() : 'http', $_domain);
                if ($this->request && $this->request->getPort()) {
                    $urlPrefix .= ':'.$this->request->getPort();
                }

                return $urlPrefix;
            }
        }
    }