public ActionResult ChangePassword()
        {
            SessionUser user = (SessionUser)Session["User"];

            string tmpStareHaslo;
            string tmpNoweHaslo;
            string tmpPotwierdzHaslo;

            WebRequest request_changePassword = WebRequest.Create("http://62.21.2.242/api/User");

            request_changePassword.Method = "PUT";
            request_changePassword.ContentType = "application/json";
            request_changePassword.Headers.Add("Authorization", "bearer " + user.access_token);

            var json = new JavaScriptSerializer().Serialize(new
            {
             tmpStareHaslo = Request["OldPassword"].ToString(),
             tmpNoweHaslo = Request["Password"].ToString(),
             tmpPotwierdzHaslo = Request["ConfirmPassword"].ToString()
        });


            using (var stream = new StreamWriter(request_changePassword.GetRequestStream()))
            {
                stream.Write(json);
            }

            var httpResponse = request_changePassword.GetResponse();

            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var responseText = streamReader.ReadToEnd();
            }

            return RedirectToAction("ChangeSettings", "User");
        }