Self-hosted WebAPI and multiple post and get methods

I have got implemented console self-hosted WebAPI app.

My controller works fine for single get and post methods.

I cannot get how to implementg multiple get and posts methods in ApiController

Startup.cs

 class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            // Initialize WebAPI
            HttpConfiguration config = new HttpConfiguration();
            config.Routes.MapHttpRoute(
                name: "apiRoute",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
            app.UseWebApi(config);

            // Initialize SignalR
            app.UseCors(CorsOptions.AllowAll);
            app.MapSignalR(); 
        } 
    }

ApiController that works fine

public class MessageController : ApiControllerWithHub<SignalMessageHub>
{
   public IEnumerable<MyItem> GetMessages()
   {
      //Code
   }

   public HttpResponseMessage PostNewMessage(User user)
   {
      // code  
   }
}

ApiController that does not work

public class MessageController : ApiControllerWithHub<SignalMessageHub>
{
   public IEnumerable<MyItem> GetMessages()
   {
      //Code
   }

   // Cannot route to those methods 
   [HttpPost()]
   [Route("api/Message/NewMessage")]
   public HttpResponseMessage PostNewMessage(User user)
   {
      // code  
   }

   [HttpPost()]
   [Route("api/Message/NewMessage2")]
   public HttpResponseMessage PostNewMessage2(User user)
   {
      // code  
   }

}