Internal Server Error when doing a POST with HttpClient in Windows Phone 8

Question

I am posting a string to a web server this way:

private async Task makeRequest(string url, string postData)
    {
        HttpClient client = null;
        HttpResponseMessage response = null;
        try
        {
            client = new HttpClient();
            response = await client.PostAsync(url, new StringContent(postData));

            response.EnsureSuccessStatusCode();
            Debug.WriteLine(response.StatusCode + " " + response.ReasonPhrase);
        }
        catch (HttpRequestException e)
        {
            Debug.WriteLine(e.Message);
        }
    }

But response.EnsureSuccessStatusCode(); throws a HttpRequestException. When I did a e.Message on the exception, it says : Response status code does not indicate success: 500 (Internal Server Error)..

What am I doing wrong that I get that error? And how do I correct it?

Answer 1

Your best solution here, as a wise man said, in HTTP there is not magic.

Download Fiddler2, setup a proxy on the emulator to connect to it. Then run your code with HttpWebRequest save the header somewhere and then run it again with HttpClient.

Compare the two files carefully and fix whats needs to be fixed. Please note that even the smallest difference might matter.

Answer 2

POSTing a StringContent will set the content type to text/plain. You might find the server doesn't like that. Try to find out what media type the server is expecting and set the Headers.ContentType of the StringContent instance.