Clock.Web/Startup.cs

namespace Clock.Web
{
    using Microsoft.AspNetCore.Builder;
    using Microsoft.AspNetCore.Hosting;
    using Microsoft.Extensions.Configuration;
    using Microsoft.Extensions.DependencyInjection;

    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.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRazorPages();
            services.AddServerSideBlazor();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env) =>
            app
                .UseDeveloperExceptionPage()
                .UseStaticFiles()
                .UseRouting()
                .UseEndpoints(endpoints =>
                {
                    endpoints.MapBlazorHub();
                    endpoints.MapFallbackToPage("/_Host");
                });
    }
}