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PO.Net CF / HttpWebRequest and a "WebException was unhandled"
 

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  1. PO.Net CF / HttpWebRequest and a "WebException was unhandled"
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    <p>I´m trying to use a Webservice in a .Net Compact Framework 3.5 Project which has no WSDL and where I have to use HttpWebRequest. I´ve tried my code on 2 Devices and on the Emulator but I get everytime the same Exception and I really don´t get why!?</p> <p>First, my code:</p> <pre><code>internal void SendSms() { HttpWebRequest req = (HttpWebRequest)WebRequest.Create(@"https://username:password@api.sipgate.net/RPC2"); req.Method = @"POST"; req.ContentType = @"text/xml"; req.ContentLength = Body.Length; using (Stream stream = req.GetRequestStream()) using (StreamWriter writer = new StreamWriter(stream, Encoding.UTF8)) { writer.Write(Body); } using (Stream responseStream = req.GetResponse().GetResponseStream()) using (StreamReader reader = new StreamReader(responseStream, Encoding.UTF8)) { string result = reader.ReadToEnd(); } } </code></pre> <p>In line "using (Stream stream = req.GetRequestStream())" I get the following exception and I can´t figure out why:</p> <p>System.Net.WebException {"Could not establish connection to network."}</p> <p>Stacktrace:</p> <p>at System.Net.HttpWebRequest.finishGetRequestStream() at System.Net.HttpWebRequest.GetRequestStream() at SipMSGate.UI.MainFormController.SendSms() at SipMSGate.UI.Form1.menuItem1_Click(Object sender, EventArgs e) at System.Windows.Forms.MenuItem.OnClick(EventArgs e) at System.Windows.Forms.Menu.ProcessMnuProc(Control ctlThis, WM wm, Int32 wParam, Int32 lParam) at System.Windows.Forms.Form.WnProc(WM wm, Int32 wParam, Int32 lParam) at System.Windows.Forms.Control._InternalWnProc(WM wm, Int32 wParam, Int32 lParam) at Microsoft.AGL.Forms.EVL.EnterMainLoop(IntPtr hwnMain) at System.Windows.Forms.Application.Run(Form fm) at SipMSGate.Program.Main()</p> <p>Status:</p> <p>System.Net.WebExceptionStatus.ConnectFailure</p> <p>I can use the Internet explorer on the Devices and on the Emulator, so I think that I have an internet Connection.</p> <p>Any Idea what´s wrong or what I forget in my code?</p> <p>Than you so much</p> <p>twickl</p> <p>Here is now the complete Code including Yakimych's Code that gives the xception on 2 Devices and the Emulator Images which all of them are having a connection to the Internet:</p> <pre><code>using System.Drawing; using System.IO; using System.Net; using System.Security.Cryptography.X509Certificates; using System.Text; using System.Windows.Forms; namespace httpreqTest { public partial class Form1 : Form { private HttpWebRequest _req; private bool _ignoreCertificateErrors; private string _errorMessage; private const string Body = "&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;&lt;methodCall&gt;&lt;methodName&gt;samurai.SessionInitiate&lt;/methodName&gt;&lt;params&gt;&lt;param&gt;&lt;value&gt;&lt;struct&gt;&lt;member&gt;&lt;name&gt;LocalUri&lt;/name&gt;&lt;value&gt;&lt;string&gt;&lt;/string&gt;&lt;/value&gt;&lt;/member&gt;&lt;member&gt;&lt;name&gt;RemoteUri&lt;/name&gt;&lt;value&gt;&lt;string&gt;01234556789&lt;/string&gt;&lt;/value&gt;&lt;/member&gt;&lt;member&gt;&lt;name&gt;TOS&lt;/name&gt;&lt;value&gt;&lt;string&gt;text&lt;/string&gt;&lt;/value&gt;&lt;/member&gt;&lt;member&gt;&lt;name&gt;Content&lt;/name&gt;&lt;value&gt;&lt;string&gt;This is a Test&lt;/string&gt;&lt;/value&gt;&lt;/member&gt;&lt;member&gt;&lt;name&gt;Schedule&lt;/name&gt;&lt;value&gt;&lt;string&gt;&lt;/string&gt;&lt;/value&gt;&lt;/member&gt;&lt;/struct&gt;&lt;/value&gt;&lt;/param&gt;&lt;/params&gt;&lt;/methodCall&gt;"; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { this._ignoreCertificateErrors = true; ASCIIEncoding encoding = new ASCIIEncoding(); byte[] byte1 = encoding.GetBytes(Body); CreateWebRequestObject(@"https://user:pass@api.sipgate.net/RPC2"); _req.Method = @"POST"; _req.ContentType = @"text/xml"; _req.ContentLength = byte1.Length; using (Stream stream = _req.GetRequestStream()) using (StreamWriter writer = new StreamWriter(stream, Encoding.UTF8)) { writer.Write(Body); } using (Stream responseStream = _req.GetResponse().GetResponseStream()) using (StreamReader reader = new StreamReader(responseStream, Encoding.UTF8)) { string result = reader.ReadToEnd(); } } public bool CreateWebRequestObject(string Url) { try { this._req = (HttpWebRequest)System.Net.WebRequest.Create(Url); if (this._ignoreCertificateErrors) ServicePointManager.CertificatePolicy = new AcceptAllCertificatePolicy(); } catch (Exception ex) { this._errorMessage = ex.Message; return false; } return true; } /// &lt;summary&gt; /// Internal object used to allow setting WebRequest.CertificatePolicy to /// not fail on Cert errors /// &lt;/summary&gt; internal class AcceptAllCertificatePolicy : ICertificatePolicy { public AcceptAllCertificatePolicy() { } public bool CheckValidationResult(ServicePoint sPoint, X509Certificate cert, WebRequest wRequest, int certProb) { // *** Always accept return true; } } } </code></pre> <p>}</p>
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    1. COMaybe it's the (s) in https that's causing the problem? You may need to validate the certificate before being able to create such a connection.
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      1. USAviad P.
    2. COTotally unrelated but you don't need to set `req.ContentLength` manually.
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      1. USDarin Dimitrov
    3. COHmm, as long as I don´t set the content Length I get an Exception that says that the Content Length can not be -1 ?!
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