useBlocking.cs

using Ben.Diagnostics;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;

namespace DetectAsync
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews();
        }
        
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseBlockingDetection();
            app.UseDeveloperExceptionPage();
            app.UseRouting();
            
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}