} else if (server_type == ServerType::PROXY_BASIC_ZMQ) {
      if (incoming_operators.size() > 0) {
        EXCEPT_PARAM(1, "Error building PROXY_BASIC_ZMQ server, operators have "
                        "been provided that will never be used!");
      }
      return std::unique_ptr<IServer>(
          new Proxy(socket_options, socket_credentials, m_log_context));
    }