如何从Windows Phone 8.1发布到PHP脚本

Question

从Windows Phone 8.1发布到PHP脚本时，我收到此错误

  

HRESULT的异常：0x80072EFD

从控制台应用程序到PHP脚本的帖子工作正常，但Windows Phone有些不同。

在我使用ASCIIEncoding的控制台应用中，但我在Windows Phone中找不到它，所以我使用的是HttpClient。我在WAMP上运行Apache。

static HttpClient clientOb = new HttpClient();
static Uri uri = new Uri("http://192.168.1.4/sign_in.php");
static Dictionary<string, string> pairs = new Dictionary<string, string>();
   public async void webReq()
   {
       try
       {
           pairs.Add("email", "1");
           pairs.Add("password", "1");
           await AsyncTask();
       }
       catch (Exception ex)
       {
           Debug.WriteLine(ex.Message);
           txtOut.Text = ex.Message;
       }

   }
   static async Task AsyncTask()
   {

       try
       {
           HttpFormUrlEncodedContent formContent = new    HttpFormUrlEncodedContent(pairs);
           HttpResponseMessage response = await clientOb.PostAsync(uri, formContent);
           if (response.IsSuccessStatusCode)
           {
               var dialog = new MessageDialog(response.Content.ToString());
               await dialog.ShowAsync();
               Debug.WriteLine(dialog);
               Debug.WriteLine("dialog");
           }
       }
       catch (Exception ex)
       {
           Debug.WriteLine(ex.Message);

       }