.NET Core Web Application - Startup configuration showing routing template via UseEndpoints middleware.

Startup.cs

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Register service to add all controllers and views for routing
        services.AddControllersWithViews();
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {

        // some middlewares
        
        app.UseRouting();

        // some more middlewares
        
        app.UseEndpoints(endpoints =>
        {
            // Routing template 
            endpoints.MapControllerRoute(
                name: "default",
                pattern: "{controller=Home}/{action=Index}/{id?}");
                
            // Above is same as calling below method
            // endpoints.MapDefaultControllerRoute()
        });
    }
}