HttpWebRequest-The remote server returned an error: (400) Bad Request

Question

I am getting The remote server returned an error: (400) Bad Request error while running the following code. I am trying to upload xml file on the http server. My xml file contains tag for the username,password and domain and when i am trying to connect is manually i am able to connect it,but using same credentials when i am trying to connect it through this code, i am getting 400 Bad Request error. Please suggest me how to overcome this issue. Thanks `

  public static void UploadHttp(string xml)     
    {

        string txtResults = string.Empty;
        try
        {
            string url = "http://my.server.com/upload.aspx ";
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.KeepAlive = false;
            request.SendChunked = true;
            request.AllowAutoRedirect = true;
            request.Method = "Post";
            request.ContentType = "text/xml";
            var encoder = new UTF8Encoding();
            var data = encoder.GetBytes(xml);
            request.ContentLength = data.Length;
            var reqStream = request.GetRequestStream();
            reqStream.Write(data, 0, data.Length);
            reqStream.Close();
            WebResponse response = null;
            response = request.GetResponse();
            var reader = new StreamReader(response.GetResponseStream());
            var str = reader.ReadToEnd();
        }
        catch (WebException ex)
        {
            if (ex.Status == WebExceptionStatus.ProtocolError)
            {
                HttpWebResponse err = ex.Response as HttpWebResponse;
                if (err != null)
                {
                    string htmlResponse = new StreamReader(err.GetResponseStream()).ReadToEnd();
                    txtResults = string.Format("{0} {1}", err.StatusDescription, htmlResponse);
                }
            }
            else
            {

            }
        }
        catch (Exception ex)
        {
            txtResults = ex.ToString();
        }
    }`

Answer 1

Are you sure you should be using POST not PUT?

POST is usually used with application/x-www-urlencoded formats. If you are using a REST API, you should maybe be using PUT? If you are uploading a file you probably need to use multipart/form-data. Not always, but usually, that is the right thing to do..

Also you don't seem to be using the credentials to log in - you need to use the Credentials property of the HttpWebRequest object to send the username and password.