HttpSelfHostServer错误502连接被拒绝

Question

我正在尝试从Pluralsight APS.NET Webapi简介中运行该示例。它是一个带有程序类

的控制台应用程序

using System.Web.Http.SelfHost;
using System.Web.Http;
using System.Net.Http;
namespace ASPNETWebAPISelfHost
{
    class Program
    {
        static void Main(string[] args)
        {
            var config =
              new HttpSelfHostConfiguration("http://localhost:8999");
            config.Routes.MapHttpRoute("DefaultRoute",
            "{controller}/{id}",
            new { id = RouteParameter.Optional });
        //custom message processing
        //var server = new HttpSelfHostServer(config,
        //      new MyNewSimpleMessageHandler());
        //controller message processing
        var server = new HttpSelfHostServer(config);
        server.OpenAsync();
        Console.ReadLine();
        var client = new HttpClient(server);
        client.GetAsync(
          "http://localhost:8999/simple").ContinueWith((t) =>
          {
              var result = t.Result;
              result.Content.ReadAsStringAsync().ContinueWith((rt) =>
              {
                  Console.WriteLine("Client got " + rt.Result);
              });
          });
        Console.WriteLine("Opening Web API SelfHost");
        Console.ReadLine();
    }
}

}

和控制器

using System.Web.Http;

namespace ASPNETWebAPISelfHost
{
  public class SimpleController : ApiController
  {
    public IEnumerable<string> Get()
    {
      return new string[] { "Hello", "ControllerAPI" };

    }
  }
}

当我在VS中运行它时，HttpClient能够检索json数据，但是当我从Fiddler进行调用时，我得到502 Server主动拒绝连接。我按照视频中的说明以管理员身份运行VS. 我怎样才能解决这个错误