Retrieve the HTTP Error code instead of "NotFound" with WebClient

10-30-2009 5:07 AM |

Hello, I am trying to catch the error returned by an external Web server but Silverlight always returned a generic error message : "The remote server returned an error: NotFound.". I would expect to have something like "Error 500 : Internal server Error".

        WebClient client = new WebClient();
        client.DownloadStringAsync( "http://myurl" );
        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(
                delegate(object sender, DownloadStringCompletedEventArgs e)
                {
                    if (e.Error != null)
                    {
                        // The bad error message
                    }
                    else
                    {
                        // process content
                    }
                }
            );

How to retrieve correctly this error code ?

Re: Retrieve the HTTP Error code instead of "NotFound" with WebClient

10-30-2009 5:37 AM |

First it should be completed event Then async call. some thing like this

WebClient client = new WebClient();
client.DownloadStringCompleted += 
  new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
client.DownloadStringAsync(new Uri("/Silverlight.js", UriKind.Relative));

 

void client_DownloadStringCompleted(object sender, 
                                    DownloadStringCompletedEventArgs e)
{
  status.Text = "Downloading...Done.";
}

Re: Retrieve the HTTP Error code instead of "NotFound" with WebClient

10-30-2009 5:39 AM |

Did you check what the type of the Exception is?

If it's a WebException (You can cast the e.Error to WebException).

WebException.Response is the WebResponse (cast it to HttpWebResponse)

HttpWebResponse.StatusCode gives you the status code.

Re: Retrieve the HTTP Error code instead of "NotFound" with WebClient

10-30-2009 6:51 AM |

Sasideva,
The code given in example is async (see the delegate method for the callback).

MarkMonster,
The exception is

-		e.Error	{System.Net.WebException: The remote server returned an error: NotFound. ---> System.Net.WebException: The remote server returned an error: NotFound.
   at System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
   at System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClass5.b__4(Object sendState)
   at System.Net.Browser.AsyncHelper.<>c__DisplayClass2.b__0(Object sendState)
   --- End of inner exception stack trace ---
   at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
   at System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result)
   at System.Net.WebClient.DownloadBitsResponseCallback(IAsyncResult result)}	System.Exception {System.Net.WebException}µ

The error returned is "NotFound" (404?) instead of 500 with a custom error message.

I have the same problem with HttpWebRequest/HttpWebResponse. The same exception is raised on the code :

                        HttpWebResponse resp=
                            (HttpWebResponse)req.EndGetResponse(result);

The exception is raised before I am able to read the Http StatusCode
Any idea ?
Thanks for your help

Re: Retrieve the HTTP Error code instead of "NotFound" with WebClient

10-30-2009 6:56 AM |

When I cast the Exception in WebException : the status is set to "UnknownError" (It is not was has been returned by the web server...).

Re: Re: Retrieve the HTTP Error code instead of "NotFound" with WebClient

10-30-2009 3:33 PM |

Strange I would expect a code like 404 when doing this:
((HttpWebReponse)((WebException)e.Error).Response).StatusCode

Re: Re: Retrieve the HTTP Error code instead of "NotFound" with WebClient

11-03-2009 4:57 AM |

Ok Thanks, I suppose I will have to write my own WebClient using Sockets (seems to be the pre history of computer science!).

Re: Re: Retrieve the HTTP Error code instead of "NotFound" with WebClient

11-27-2009 12:58 AM |

 Hello Maud,

 Do you know if this has changed in Silverlight 3 with

HttpWebRequest.RegisterPrefix( "http://", System.Net.Browser.WebRequestCreator.ClientHttp );

Thanks.