/// <summary>
        /// Execute request
        /// </summary>
        /// <param name="values">List of parameters for request (HttpContent = StringContent serialize to Json)"</param>
        /// <returns>T</returns>
        public async Task <T> ExecuteContent(Dictionary <string, string> values)
        {
            RestResponse <T> response = await Execute(values);

            return(response.Content);
        }
        /// <summary>
        /// Execute request
        /// </summary>
        /// <param name="values">List of parameters for request (HttpContent = FormUrlEncodedContent)</param>
        /// <returns>T</returns>
        public async Task <T> ExecuteContent(IEnumerable <KeyValuePair <string, string> > values)
        {
            RestResponse <T> response = await Execute(values);

            return(response.Content);
        }