Web Api Api控制器中的多个Post和Get方法

Question

web api Get方法给我404错误。这就是我正在做的事情

网络Api路由

 config.Routes.MapHttpRoute(
        name: "DefaultApi2",
        routeTemplate: "api/{controller}/{action}/{id}",
        defaults: new { id = RouteParameter.Optional }
        );

Web Api控制器方法

    [HttpGet]
    public GameDto GetGameById(int gameId)
    {
      //My code here
    }
    [HttpGet]
    public List<GameDto> GetUserGames(int userId)
    {
      //My code here
     }

    [HttpGet]
    [ActionName("GetPublicGames")]
    public List<GameDto> GetPublicGames(int requestUserId, int start, int limit)
    {
      //My code here
    }
     [HttpPost]
    [ActionName("CreateGame")]
    public HttpResponseMessage CreateGame(GameDto gameDto)
    {
     //My code here
    }
    [HttpPost]
    [ActionName("UserRequestToJoin")]
    public HttpResponseMessage ProcessGameInvitationRequest(GameInvitationDto gameInvitationDto)
    {
      //My code here
    }

客户代码

try
        {             
             HttpClient client = new HttpClient();
            client.BaseAddress = new Uri("http://localhost:59580/");            
            client.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));
            var response = await client.GetAsync("api/Game/GetGameById?gameId=1");
            response.EnsureSuccessStatusCode(); // Throw on error code.                
            var gameDto = await response.Content.ReadAsAsync<GameDto>();
            MessageBox.Show(gameDto.Name);
        }
        catch (Newtonsoft.Json.JsonException jEx)
        {
            // This exception indicates a problem deserializing the request body.
            MessageBox.Show(jEx.Message);
        }
        catch (HttpRequestException ex)
        {
            MessageBox.Show(ex.Message);
        }

当我从localhost运行此代码时，所有web api方法都会执行任何问题。但是在生产中只有post方法正在运行而Get方法返回404错误。
生产是：.Net 4.5和IIS 7