string url = urlApiTextBox.Text;
            string authorization = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", loginTextBox.Text, passwordTextBox.Text)));
            
            var client = new HttpClient();
            client.BaseAddress = new Uri(urlApiTextBox.Text);
            client.DefaultRequestHeaders.AcceptLanguage.Clear();
            client.DefaultRequestHeaders.AcceptLanguage.Add(new StringWithQualityHeaderValue("ru"));
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            client.DefaultRequestHeaders.Add("Authorization", string.Format("Basic {0}", authorization));
            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get,  "/service/version");
            request.Content = new StringContent(client.ToString(), Encoding.UTF8, "application/json");
            client.SendAsync(request).ContinueWith(responseTask =>
              {
                  MessageBox.Show(responseTask.Result.ToString());
              });