public static void RegisterFormatters(MediaTypeFormatterCollection formatters)
        {
            var jsonFormatter = formatters.JsonFormatter;
            jsonFormatter.SerializerSettings = new JsonSerializerSettings
            {
                ContractResolver = new CamelCasePropertyNamesContractResolver()
            };

            // Insert the JSONP formatter in front of the standard JSON formatter.
            var jsonpFormatter = new JsonpFormatter();
            formatters.Insert(0, jsonpFormatter);
        }
        /// <summary>
        /// Override this method to capture the Request object
        /// </summary>
        /// <param name="type"></param>
        /// <param name="request"></param>
        /// <param name="mediaType"></param>
        /// <returns></returns>
        public override MediaTypeFormatter GetPerRequestFormatterInstance(Type type, System.Net.Http.HttpRequestMessage request, MediaTypeHeaderValue mediaType)
        {
            var formatter = new JsonpFormatter()
            {
                JsonpCallbackFunction = GetJsonCallbackFunction(request)
            };

            // this doesn't work unfortunately
            //formatter.SerializerSettings = GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings;

            // You have to reapply any JSON.NET default serializer Customizations here
            formatter.SerializerSettings.Converters.Add(new StringEnumConverter());
            formatter.SerializerSettings.Formatting = Newtonsoft.Json.Formatting.Indented;

            return formatter;
        }