Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.SpaServices.Webpack;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace AureliaDemo
{
    public class Startup
  {
    public void ConfigureServices(IServiceCollection services)
    {
      services.AddMvc();
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
      loggerFactory.AddConsole();

      if (env.IsDevelopment())
      {
        app.UseDeveloperExceptionPage();
        app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions
        {
          HotModuleReplacement = true
        });
      }

      app.UseStaticFiles();

      app.UseMvc(routes =>
      {        
        routes.MapSpaFallbackRoute("spa-fallback", new { controller = "Home", action = "Index" });
      });
    }
  }
}