Startup.cs

using BlazorSignalRApp.Server.Hubs;
using BlazorSignalRApp.Shared;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.ResponseCompression;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Configuration;
using System.Linq;

namespace BlazorSignalRApp.Server
{
    public class Startup
    {
        // 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.AddSignalR();
            services.AddMvc();
            //            services.AddDbContext<QuizDBContext>(opt => opt.UseInMemoryDatabase("Quiz"));
            services.AddDbContext<QuizDBContext>(opt => opt.UseSqlite("Data Source=Quiz.db"));
            services.AddSwaggerDocument();
            services.AddResponseCompression(opts =>
            {
                opts.MimeTypes = ResponseCompressionDefaults.MimeTypes.Concat(
                    new[] { "application/octet-stream" });
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseResponseCompression();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseBlazorDebugging();
            }

            app.UseStaticFiles();
            app.UseOpenApi();
            app.UseSwaggerUi3();
            app.UseClientSideBlazorFiles<Client.Program>();

            app.UseRouting();

            #region snippet
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapDefaultControllerRoute();
                endpoints.MapHub<QuizHub>("/quizHub");
                endpoints.MapFallbackToClientSideBlazor<Client.Program>("index.html");
            });
            #endregion
        }
    }
}