It looks like so far the documentation has not been update, as you probably saw.

But if you want to do some digging, in the Umbraco.Web folder, there is a Routing folder and in the main Umbraco.web there is a RouteCollectionExtensions class.

if you check the github docs repo, there is mention about compositions and that ApplicationEventHandler is gone.

https://github.com/umbraco/UmbracoDocs/blob/master/Tutorials/Porting-Packages-V8/index.md

I think you need to use composition now.

https://our.umbraco.com/forum/umbraco-8/96167-registering-custom-routes-in-umbraco-8#comment-304611

Hi guys,

any of you have a solution for this?

We are having this problem right now --> https://our.umbraco.com/forum/umbraco-8//99009-umbraco-v8-custom-routing-for-umbracoapicontroller

Thanks!

Hi, Simple custom controller solution:

code

 using System.Web.Mvc;
 using Umbraco.Web.Mvc;

namespace UmbracoDemo.Controllers
{
    public class HomeController : UmbracoController
    {
        // GET: Home
        public ActionResult Index()
        {
            return View();
        }
    }
}

code

using System;
using System.Web.Mvc;
using System.Web.Routing;
using Umbraco.Core;
using Umbraco.Core.Composing;
using UmbracoDemo.Controllers;
namespace UmbracoDemo {
    public class RegisterCustomRouteComposer : IUserComposer
    {
        public void Compose(Composition composition)
        {
             composition.Register<HomeController>(Lifetime.Request);
             composition.Components()
             .Append<RegisterCustomRouteComponent>();
        }
}
public class RegisterCustomRouteComponent : IComponent
{
    public void Initialize()
    {
        RouteTable.Routes.MapRoute(
            "HomePage",
            "home/index",
            new { controller = "Home", action = "Index" }
            );
    }

    public void Terminate()
    {
        throw new NotImplementedException();
    }
}

}

is working on a reply...