code: def proxy_server(self):
          
          # TODO: Workaround for SMC 6.4.3 which only provides the inspected service
          # reference. We need to find the Proxy Server from this ref.
          if self._inspected_service_ref:
              for proxy in ProxyServer.objects.all():
                  if self._inspected_service_ref.startswith(proxy.href):
                      return proxy
docs: The ProxyServer element referenced in this protocol parameter, if any.
          
          :return: The proxy server element or None if one is not assigned
          :rtype: ProxyServer