Termination of middleware

Main processing request directly inside the 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace WebApplication2
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //CreateHostBuilder(args).Build().Run();     
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseIISIntegration()
                .Configure(app =>
                {
                    app.Run(async (context) =>
                    {
                        var path = context.Request.Path;
                        await context.Response.WriteAsync(path);
                    });
                }).Build();
            host.Run();

        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }
}