Startup.cs

using System;
using System.IO;
using AspCoreServer.Data;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.SpaServices.Webpack;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Net.Http.Headers;
using Swashbuckle.AspNetCore.Swagger;
using WebEssentials.AspNetCore.Pwa;

namespace AspCoreServer {
    public class Startup {
        public Startup (IHostingEnvironment env) {
            var builder = new ConfigurationBuilder ()
                .SetBasePath (env.ContentRootPath)
                .AddJsonFile ("appsettings.json", optional : true, reloadOnChange : true)
                .AddJsonFile ($"appsettings.{env.EnvironmentName}.json", optional : true)
                .AddEnvironmentVariables ();
            this.Configuration = builder.Build ();
        }

        public IConfigurationRoot 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.AddNodeServices ();
            services.AddHttpContextAccessor ();
            services.AddProgressiveWebApp (new PwaOptions { Strategy = ServiceWorkerStrategy.CacheFirst, RegisterServiceWorker = true, RegisterWebmanifest = true }, "manifest.json");

            var connectionStringBuilder = new Microsoft.Data.Sqlite.SqliteConnectionStringBuilder { DataSource = "spa.db" };
            var connectionString = connectionStringBuilder.ToString();

            services.AddDbContext<SpaDbContext>(options =>
               options.UseSqlite(connectionString));

            // Register the Swagger generator, defining one or more Swagger documents
            services.AddSwaggerGen (c => {
                c.SwaggerDoc ("v1", new Info { Title = "Angular 7.0 Universal & ASP.NET Core advanced starter-kit web API", Version = "v1" });
            });
        }

        // 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, SpaDbContext context) {
            loggerFactory.AddConsole (this.Configuration.GetSection ("Logging"));
            loggerFactory.AddDebug ();

            // app.UseStaticFiles();

            app.UseStaticFiles (new StaticFileOptions () {
                OnPrepareResponse = c => {
                    //Do not add cache to json files. We need to have new versions when we add new translations.
                    c.Context.Response.GetTypedHeaders ().CacheControl = !c.Context.Request.Path.Value.Contains (".json")
                        ? new CacheControlHeaderValue () {
                            MaxAge = TimeSpan.FromDays (30) // Cache everything except json for 30 days
                        }
                        : new CacheControlHeaderValue () {
                            MaxAge = TimeSpan.FromMinutes (15) // Cache json for 15 minutes
                        };
                }
            });

            if (env.IsDevelopment ()) {
                app.UseDeveloperExceptionPage ();
                app.UseWebpackDevMiddleware (new WebpackDevMiddlewareOptions {
                    HotModuleReplacement = true,
                        HotModuleReplacementEndpoint = "/dist/"
                });
                app.UseSwagger ();
                app.UseSwaggerUI (c => {
                    c.SwaggerEndpoint ("/swagger/v1/swagger.json", "My API V1");
                });

                // Enable middleware to serve swagger-ui (HTML, JS, CSS etc.), specifying the Swagger JSON endpoint.

                app.MapWhen (x => !x.Request.Path.Value.StartsWith ("/swagger", StringComparison.OrdinalIgnoreCase), builder => {
                    builder.UseMvc (routes => {
                        routes.MapSpaFallbackRoute (
                            name: "spa-fallback",
                            defaults : new { controller = "Home", action = "Index" });
                    });
                });
            } else {
                app.UseMvc (routes => {
                    routes.MapRoute (
                        name: "default",
                        template: "{controller=Home}/{action=Index}/{id?}");

                    routes.MapRoute (
                        "Sitemap",
                        "sitemap.xml",
                        new { controller = "Home", action = "SitemapXml" });

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

                });
                app.UseExceptionHandler ("/Home/Error");
            }
        }
    }
}