private static async Task Post()
        {
            HttpWebRequest request = (HttpWebRequest) WebRequest.Create("http://localhost:5000/setxml");
            try
            {
                request.Method = "POST";
                var data = System.Text.Encoding.UTF8.GetBytes("xml="+File.ReadAllText("file1.xml"));

                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = data.Length;
                using (Stream dataStream = request.GetRequestStream())
                {
                    dataStream.Write(data, 0, data.Length);
                }

                var response = (HttpWebResponse) await request.GetResponseAsync();
                using (Stream stream = response.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(stream))
                    {
                        string line = "";
                        while ((line = reader.ReadLine()) != null)
                        {
                            Console.WriteLine(line);
                        }
                    }
                }

                response.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }


            Console.WriteLine("Запрос выполнен");
            Console.Read();
        }