在Angular http客户端的帮助下发送表单数据，现在我不仅想订阅事件，还想订阅从服务器返回的数据。事件用于显示进度条，数据是我想向用户显示的内容。这是代码片段：

const req = new HttpRequest('POST', url, newFormData, {
    reportProgress: true,
    responseType: 'text' as 'json'
  });

  // create a new progress-subject for every file
  const progress = new Subject<number>();

  // send the http-request and subscribe for progress-updates

  this.http.request(req).subscribe(event => {
    if (event.type === HttpEventType.UploadProgress) {
      // calculate the progress percentage
      const percentDone = Math.round(100 * event.loaded / event.total);

      // pass the percentage into the progress-stream
      progress.next(percentDone);
    } else if (event instanceof HttpResponse) {
      // Close the progress-stream if we get an answer form the API
      // The upload is complete
      progress.complete();
    }
  });

所以在这里我可以订阅事件和它的工作很好，但我也希望服务器发回的响应数据。有没有办法订阅事件和数据对象。请帮助！