mvc Web api 无法获取session

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Optimization;
using System.Web.Routing;
using System.Web.SessionState;

namespace SocialMasterDataPortal
{
    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            this.InitializeAll();
            //GlobalConfiguration.Configure(WebApiConfig.Register);
            WebApiConfig.Register(GlobalConfiguration.Configuration);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            GlobalConfiguration.Configuration.EnsureInitialized();
            Heart.Initilize();

       
        }

        //用于在webapi中支持session，重载这个方法就好了
        public override void Init()
        {
            this.PostAuthenticateRequest += (sender, e) => HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
            base.Init();
        }

    }
}