Expectation Failed (417)

[Obaid ur Rehman]

I am trying to a POST request from the following C# snippet and I keep getting a 417 (Expectation Failed) error. Any idea why?

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Timeout = REQUEST_TIMEOUT;
request.Method = "POST";
request.GetRequestStream().Write(System.Text.ASCIIEncoding.ASCII.GetBytes(payload), 0, 

                     System.Text.ASCIIEncoding.ASCII.GetBytes(payload).Length); 
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

[Obaid]

I figured it out. It was sending  Expect: 100-Continue  header on POST request. Removing it solves the problem :-)