gistfile1.txt

                //HttpRequest
                byte[] bytesInStream = new byte[req.ContentLength.GetValueOrDefault()];
                req.Body.Read(bytesInStream, 0, bytesInStream.Length);
                
                //HttpRequestMessage
                using (Stream requestStream = await req.Content.ReadAsStreamAsync())
                {
                    byte[] bytesInStream = new byte[requestStream.Length];
                    requestStream.Read(bytesInStream, 0, (int)bytesInStream.Length);
                }