public static async Task <bool> CheckExistenceAsync(string encryptedString)
        {
            bool   exists           = false;
            string boomserverExists = (boomServer + "/users/exists?s=");
            Url    existsUrl        = new Url(boomserverExists + encryptedString);

            //-------------------------------------------------------
            //HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(existsUrl.ToString());
            //request.Method = "GET";
            //using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            //{

            //}
            try
            {
                HttpResponseMessage response = await existsUrl.AllowHttpStatus("404").SendAsync(HttpMethod.Get, null);

                exists = (response.StatusCode == System.Net.HttpStatusCode.NoContent);
            }
            catch (Exception exception)
            {
                try
                {
                    TraceHelper.TraceException("D7B1FC61_D70A_4A08_9235_0236C3904065", exception);
                }
                catch (Exception)
                {
                }
            }


            return(exists);
        }
 public static IFlurlRequest AllowNonOkCodes(this Url url)
 {
     return(url.AllowHttpStatus(HttpStatusCode.NotFound)
            .AllowHttpStatus(HttpStatusCode.Conflict));
 }