Umbraco Autofac configuration web API

using Autofac;
using Autofac.Core;
using Autofac.Integration.Mvc;
using Autofac.Integration.WebApi;
using System.Reflection;
using System.Web.Http;
using System.Web.Mvc;
using tungsten.cms.TungstenServices;
using Umbraco.Core;
using Umbraco.Core.Services;
using Umbraco.Web;

namespace tungsten.cms.AppStarting
{
    public class AutofacStartup
    {
        public static void RegisterComponents(ApplicationContext applicationContext)
        {
            var builder = new ContainerBuilder();

            //Register the UmbracoContext as a factory
            builder.Register(c => UmbracoContext.Current).AsSelf();
            //register umbracoHelper content query
            builder.RegisterInstance(new UmbracoHelper(UmbracoContext.Current).ContentQuery).As<ITypedPublishedContentQuery>();

            //register Umbraco API controllers - required for backoffice to function
            builder.RegisterApiControllers(typeof(UmbracoApplication).Assembly);

            //register custom controller
            builder.RegisterControllers(Assembly.GetExecutingAssembly());
            builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

            //register all class by default which names correspond to naming convension SomeClass to ISomeClass
            var servicesAssembly = Assembly.GetAssembly(typeof(ITungstenDictionaryService));
            builder.RegisterAssemblyTypes(servicesAssembly).AsImplementedInterfaces();

            //register Umbraco services, ovveride deafult bindings
            builder.RegisterInstance(applicationContext.Services.ContentService).As<IContentService>();
            builder.RegisterInstance(applicationContext.Services.LocalizationService).As<ILocalizationService>();

            var container = builder.Build();

            //setup the webapi dependency resolver to use autofac
            var resolver = new AutofacWebApiDependencyResolver(container);
            GlobalConfiguration.Configuration.DependencyResolver = resolver;
            //setup the mvc dependency resolver to user autofac
            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        }
    }
}