docs: def _generate_url_root(protocol, host, port):
          """
          Generate API root URL without resources
          :param protocol: Web protocol [HTTP | HTTPS] (string)
          :param host: Hostname or IP (string)
          :param port: Service port (string)
          :return: ROOT url
          """
          return URL_ROOT_PATTERN.format(protocol=protocol, host=host, port=port)