WP7 HttpWebRequest POST, server returns "{ result: 'ok' }\" in emulator, but "error: NotFound" on device

I'm trying to do a very basic http POST to a web service from my Windows Phone 7 app. I know the web service works fine because I'm using it for three other mobile platforms.

I've modified the C# example from http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.begingetrequeststream.aspx

    string boundary = DateTime.Now.Ticks.ToString();
    private void POST_TEST(object sender, RoutedEventArgs e)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Constants.JSON_URL_PREFIX + Settings.Settings.DeviceID + "/inquiry/new/");
        request.ContentType = "multipart/form-data; boundary=" + boundary;
        request.Method = "POST";

        request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);
    }

    public void GetRequestStreamCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

        Stream postStream = request.EndGetRequestStream(asynchronousResult);

        StringBuilder postData = new StringBuilder();
        postData.Append("--" + boundary + "\r\n");
        postData.Append("Content-Disposition: form-data; name=\"body\"\r\n\r\n");
        postData.Append("test 123");
        postData.Append("\r\n--" + boundary + "\r\n");

        byte[] byteArray = Encoding.UTF8.GetBytes(postData.ToString());

        postStre开发者_如何学JAVAam.Write(byteArray, 0, postData.Length);
        postStream.Close();

        request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
    }

    private static void GetResponseCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

        // End the operation
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
        Stream streamResponse = response.GetResponseStream();
        StreamReader streamRead = new StreamReader(streamResponse);
        string responseString = streamRead.ReadToEnd();
        // Close the stream object
        streamResponse.Close();
        streamRead.Close();

        // Release the HttpWebResponse
        response.Close();
    }

I'm receiving "{ result: 'ok' }" from the server when I run this in the emulator, but "error: NotFound" when I run it on my Samsung Focus. I'm assuming this has to do with the way a string is converted to a byte[] on the phone versus a desktop computer.

Any ideas on a fix? Maybe this is a known error that I never ran across searching the web for an answer?

I finally figured out that my phone's Unique ID / Device ID has a forward-slash in it. This caused a problem when I constructed the web service Uri at:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Constants.JSON_URL_PREFIX + Settings.Settings.DeviceID + "/inquiry/new/");

Uri emulator example: http://www.blah.com/abc_123=/inquiry/new/
Uri device example: http://www.blah.com/abc/123=/inquiry/new/

Obviously, it worked fine in the emulator because the emulator's device ID doesn't have a forward-slash in it. Essentially, the Uri I was trying to post to was incorrect.

Kind of an obscure bug...

Thanks Opena and Matt. Your suggestions gave me things to try and eventually helped me see the problem.

I use this solution on an app but my postData looks like postData.Append("test=123"). I don't use boundaries (I thought boundaries were only for mails ?)
Also my request.ContentType is request.ContentType = "application/x-www-form-urlencoded";