webClient DownloadStringAsync failed

10-24-2008 2:34 AM |

Hi

I successfully send http request from winform C# application (see code1)
but from silverlight (see code2) I obtain an error.(see error)

Peharps the problem is that my server is https and the remote is also https.

How I modify my server to be http ???

Thanks in advance
Fred

code1 (Winform C# succeeded)

private void button1_Click(object sender, EventArgs e)
        {
            try
            {

                WebClient client = new WebClient();
                // Add a user agent header in case the requested URI contains a query.
                client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
                client.QueryString.Add("user", "AAA");
                client.QueryString.Add("password", "1111111");
                client.QueryString.Add("api_id", "3126312");
                client.QueryString.Add("to", "972545665417");
                client.QueryString.Add("text", "This is an example message");
                string baseurl = "http://api.clickatell.com/http/sendmsg";
                Stream data = client.OpenRead(baseurl);
                StreamReader reader = new StreamReader(data);
                string s = reader.ReadToEnd();
                data.Close();
                reader.Close();
                MessageBox.Show(s);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

code2 (silverlight failed)

private void sendSMS()
        {
            WebClient client = new WebClient ();
            client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
           
            string baseurl ="http://api.clickatell.com/http/sendmsg";
            baseurl +="?user=AAA";
            baseurl +="&password=1111111";
            baseurl +="&api_id=3126312";
            baseurl +="&to=972545665417";
            baseurl +="&text=This+is+an+example+message";

            Uri uri = new Uri(baseurl, UriKind.Absolute);
            client.DownloadStringAsync(new Uri(baseurl));
        }

        void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
           
            if (e.Error == null)
            {
                string s = e.Result.ToString();
                Debugger.Log(0, "debug", "s=" + s+ "\r\n");
            }
            else
                Debugger.Log(0, "debug", "error=" + e.Error.ToString()+ "\r\n");
        }

error
baseurl=http://api.clickatell.com/http/sendmsg?user=AAA&password=1111111&api_id=3126312&to=972545665417&text=This+is+an+example+message
'iexplore.exe' (Silverlight): Loaded 'C:\Program Files\Microsoft Silverlight\2.0.31005.0\en-US\mscorlib.debug.resources.dll'

error=System.Security.SecurityException ---> System.Security.SecurityException: Security error.
   at System.Net.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
   at System.Net.BrowserHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
   at System.Net.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(Object sendState)
   --- End of inner exception stack trace ---
   at System.Net.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
   at System.Net.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result)
   at System.Net.WebClient.DownloadBitsResponseCallback(IAsyncResult result)

Re: webClient DownloadStringAsync failed

10-25-2008 2:57 AM |

Have you created a crossdomain file on your server? The error you're getting looks like a crossdomain security issue.

Re: webClient DownloadStringAsync failed

10-25-2008 2:15 PM |

 Thanks for your response

I define a clientaccesspolicy.xml in my web application that contains this 

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
  <cross-domain-access>
    <allow-from http-request-headers="*">
      <domain uri="*"/>
    </allow-from>
    <grant-to>
      <resource path="/" include-subpaths="true"/>
    </grant-to>
  </cross-domain-access>
</access-policy>

without success

Could you tell me what is missing ?

thanks

Fred 

Re: Re: webClient DownloadStringAsync failed

10-26-2008 3:56 AM |

 try to install fiddler to check if someone is wrong ;)...have a look to my old post: http://silverlight.net/forums/t/39985.aspx

Re: Re: webClient DownloadStringAsync failed

10-26-2008 5:12 AM |

Hi

Do you mean that the remote server (api.clickatell.com)

I try to access have to be the clientaccesspolicy.xml existing ?

This is what I obtain from Fiddler

 GET http://api.clickatell.com/clientaccesspolicy.xml
404 Not Found

 .REQUEST { font: 8pt Courier New; color: blue;} .RESPONSE { font: 8pt Courier New; color: green;}GET /clientaccesspolicy.xml HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Host: api.clickatell.com
Proxy-Connection: Keep-Alive

HTTP/1.1 404 Not Found
Via: 1.1 Address Is Hidden
Connection: Keep-Alive
Proxy-Connection: Keep-Alive
Content-Length: 304
Date: Sun, 26 Oct 2008 08:57:58 GMT
Content-Type: text/html; charset=iso-8859-1
Server: Apache/2.2.3 (Red Hat)
Keep-Alive: timeout=10, max=50

Thanks

Fred

Re: Re: Re: webClient DownloadStringAsync failed

10-26-2008 5:28 AM |

 HI, as you can see, clientpolicy.xml  must be on the server( your application tries to download it but it can't find)....

So you have to put it on the server, not in your application ;)

Mark this post  as answer if it solves your problem ;)

Bye