code: public SmsStatusPullCallbackResult pullCallback(int max)
              throws HTTPException, JSONException, IOException {
  
          // May throw IOException
          HTTPResponse res = pull(0, max);
  
          // May throw HTTPException
          handleError(res);
  
          // May throw JSONException
          return (new SmsStatusPullCallbackResult()).parseFromHTTPResponse(res);
      }
docs: 拉取回执结果
  
  @param max  最大条数, 最多100
  @return {@link}SmsStatusPullCallbackResult
  @throws HTTPException  http status exception
  @throws JSONException  json parse exception
  @throws IOException    network problem