尝试用HttpWebRequest获取Gmail联系人的分组信息，但是总是报异常 The remote Server returned an error:not found
不知道怎么回事，这段代码在pc上跑是没有问题的，但是移植到wp7上就出问题了，希望高手速度来解救！
  public void GetGroups()
  {
  HttpWebRequest request = WebRequest.Create("https://www.google.com/m8/feeds/groups/default/full?v=3.0") as HttpWebRequest;
  request.Method = "GET";
  request.Headers[HttpRequestHeader.Authorization] = "GoogleLogin auth=" + AuthToken;
  request.BeginGetResponse(new AsyncCallback(GetGetGroupsResponse), request);
  }

  public void GetGetGroupsResponse(IAsyncResult result)
  {
  try
  {
  HttpWebRequest req = result.AsyncState as HttpWebRequest;
  HttpWebResponse resp = req.EndGetResponse(result) as HttpWebResponse;
  if (resp.StatusCode == HttpStatusCode.OK)
  {
  Stream s = resp.GetResponseStream();
  StreamReader sr = new StreamReader(s);
  AllGroups = XElement.Load(XmlReader.Create(resp.GetResponseStream()));
  PraseGroupXML();
  if (GetGroupsCompleted != null)
  {
  GetGroupsCompleted(this, new EventArgs());
  }
  }

  foreach (GroupAllInfo info in groupAllInfo)
  {
  Debug.WriteLine(info.title);
  }
    
  }
  catch (System.Exception ex)
  {
  if (ErrorEvent != null)
  {
  ErrorEvent(ex.Message, new EventArgs());
  }
  }
  }