public string ApiAuthorization_with_HTML(string login, string TID, string pass, string page, string userIP, string system)
        {
            string strMdD5 = hashMD5.HashAuthorization_with_HTML(login, TID, pass, system);

            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(URL_API_FUNDIST);
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json");
                HttpResponseMessage response = client.GetAsync("System/Api/" + API_KEY + "/User/AuthHTML/?&Login="******"&Password="******"&System=" + system + "&TID=" + TID + "&Hash=" + strMdD5 + "&Page=" + page + "&UserIP=" + userIP).Result;
                if (response.IsSuccessStatusCode)
                {
                    return(response.Content.ReadAsStringAsync().Result);
                }
                return(null);
            }
        }