public HttpClient CreateClient()
        {
            if (_httpClient == null)
            {
                _httpClient = new HttpClient();
            }
            _httpClient.DefaultRequestHeaders.Clear();
            DateTime dtNow   = DateTime.UtcNow;
            var      saltKey = Guid.NewGuid().ToString();

            _httpClient.DefaultRequestHeaders.Add("token", ValidateHelper.GetToken(dtNow, saltKey));
            _httpClient.DefaultRequestHeaders.Add("version", AppConfigurations.AppVersion.ToString());
            _httpClient.DefaultRequestHeaders.Add("sk", saltKey);
            return(_httpClient);
        }