public static async Task<T> ReadAsync<T>(this HttpContent httpContent)
        {
            var mediaType = httpContent.Headers.ContentType.MediaType;
            if (mediaType != "application/json")
            {
                throw new FormatException();
            }
            using (var stream = await httpContent.ReadAsStreamAsync())
            using (var sr = new StreamReader(stream))
            using (var jsonTestReader = new JsonTextReader(sr))
            {
                var jsonSerializer = new JsonSerializer();
                return jsonSerializer.Deserialize<T>(jsonTestReader);
            }
        }