Method onMessageBegin

deps/undici/undici.js:7344–7359

* @returns {0|-1}

()

       * @returns {0|-1}
       */
      onMessageBegin() {
        const { socket, client } = this;
        if (socket.destroyed) {
          return -1;
        }
        if (client[kRunning] === 0) {
          util.destroy(socket, new SocketError("bad response", util.getSocketInfo(socket)));
          return -1;
        }
        const request = client[kQueue][client[kRunningIdx]];
        if (!request) {
          return -1;
        }
        request.onResponseStarted();
        return 0;
      }
      /**
       * @param {Buffer} buf
       * @returns {number}