CODEWITHSUNDEEP
httpwindows-phone-7posthttpwebrequest
NathanErtner
NathanErtner

Reputation: 141

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());

        postStream.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?

Upvotes: 2

Views: 2837

Answers (2)

NathanErtner
NathanErtner

Reputation: 141

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.

Upvotes: 2

Opena
Opena

Reputation: 11

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";

Upvotes: 0

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