The remote server returned an error: (411) Length Required

When we make a HttpWebRequest using method POST, we must specify the length of data sending.

 

string data = "Test data to be sent";
byte[] postData = Encoding.ASCII.GetBytes(data);
webRequest.ContentLength = postData.Length;

If we wish not to send any data, just set it to 0.. 

webRequest.ContentLength = 0;

Note: If we are not sending any data, we should use the GET method.