HttpWebRequest 返回BadRequest(400) 同时返回Response

今天用Fiddler分析安卓APP的一个登陆功能的时候，账号和密码错误会返回相应的消息，并且状态码是400。

 

正常用法：

 1         /// <summary>

 2         /// 读取返回的内容

 3         /// </summary>

 4         /// <param name="asyncresult"></param>

 5         private void ReadCallBack(IAsyncResult asyncresult)

 6         {

 7             String result = String.Empty;

 8             try

 9             {

10                 HttpWebRequest myrequest = (HttpWebRequest)asyncresult.AsyncState;

11                 HttpWebResponse response = (HttpWebResponse)myrequest.EndGetResponse(asyncresult);

12 

13                 //读取返回对象

14                 Stream responseStream = response.GetResponseStream();

15 

16                 using (var render = new StreamReader(responseStream, Encoding.UTF8))

17                 {

18                     result = render.ReadToEnd();

19                     render.Close();

20                 }

21             }

22             catch (Exception ex)

23             {

24 

25                 Console.WriteLine("出现异常：" + ex.Message);

26             }

27             //处理返回消息

28             if (Handler != null)

29                 Handler(result);

30         }

当执行GetResponseStream就抛出异常了，异常提示是BadRequest.

要想获取400返回的信息，需要对catch部分做特殊处理。

添加catch代码：

 1 catch (Exception ex)

 2 {

 3     using (WebResponse response = e.Response)

 4         {

 5             HttpWebResponse httpResponse = (HttpWebResponse)response;

 6                 using (Stream data = response.GetResponseStream()){

 7                     using (var reader = new StreamReader(data))

 8                     {

 9                              string text = reader.ReadToEnd();

10                              Console.WriteLine(text);

11                     }

12         　　　　}

13          }

14 }

 

这样就可以获取到400返回的消息了。

stackoverflow问题链接：

http://stackoverflow.com/questions/692342/net-httpwebrequest-getresponse-raises-exception-when-http-status-code-400-ba

http://stackoverflow.com/questions/11660947/httpwebrequest-getresponse-throws-bad-request-400-error