Asp.net WebApi HttpClient строго типизированный PostAync

Я пытаюсь отправить сообщение в Asp.Net WebApi Метод публикации:

 // POST /api/citycode
public HttpResponseMessage<CityCode> Post(CityCode citycode)
{
    try
    {
        Test.SelfTrackingEntities.BusinessLayer.BusinessManagers.CityCodeManager myCityCodeManager = new CityCodeManager(Utility.GetConnectionString());
        var id = myCityCodeManager.Create(citycode);

        var response = new HttpResponseMessage<Test.SelfTrackingEntities.BusinessLayer.BusinessEntities.CityCode>(citycode) { StatusCode = HttpStatusCode.Created };
        response.Headers.Location = new Uri(VirtualPathUtility.AppendTrailingSlash(Request.RequestUri.ToString()) + citycode.Name);
        return response;
    }
    catch (Exception e)
    {
        var response = new HttpResponseMessage(HttpStatusCode.Conflict);
        response.Content = new StringContent(e.Message);
        throw new HttpResponseException(response);
    }
}

Вызов клиента:

var objectContent = CreateJsonObjectContent(citycode);
objectContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
var requestMessage = new HttpRequestMessage<CityCode>(citycode, jsonMediaType);
return httpClient.PostAsync(addressSuffix, objectContent).ContinueWith(task =>
{
    var responseMessage = task.Result;
    return responseMessage.Content.ReadAsAsync<CityCode>().ContinueWith(readTask =>
    {
        return readTask.Result;
    });
}).Unwrap();

Но сервер никогда не получает вызов, я использую JsonNetFormatter не встроенный форматтер.