Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.SpaServices.Webpack;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using ChatApplicationAureliaSignalR.Hubs;

namespace ChatApplicationAureliaSignalR {
  public class Startup {

    public Startup( IConfiguration configuration ) {
      Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices( IServiceCollection services ) {
      // Add framework services.
      services.AddMvc( );

      services.AddSignalR( );
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure( IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory ) {
      if ( env.IsDevelopment( ) ) {
        app.UseDeveloperExceptionPage( );
        app.UseWebpackDevMiddleware( new WebpackDevMiddlewareOptions {
          HotModuleReplacement = true,
          ConfigFile = "webpack.netcore.config.js",
          HotModuleReplacementClientOptions = new Dictionary<string, string> { { "reload", "true" }
            }
        } );
      } else {
        app.UseExceptionHandler( "/Home/Error" );
      }

      app.UseStaticFiles( );

      app.UseSignalR( routes => {
        routes.MapHub<ChatHub>( "/chat" );
      } );

      app.UseMvc( routes => {
        routes.MapRoute(
          name: "default",
          template: "{controller=Home}/{action=Index}/{id?}" );

        routes.MapSpaFallbackRoute(
          name: "spa-fallback",
          defaults: new { controller = "Home", action = "Index" } );
      } );

    }
  }
}