Koa / Owin

owin.cs

using Microsoft.Owin.Hosting;
using Owin;
using System;

namespace ConsoleApplication43
{
    class Program
    {
        static void Main(string[] args)
        {
            using (WebApp.Start<Startup>("http://localhost:12345"))
            {
                Console.ReadLine();
            }

        }
    }

    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            // KoaとOwinを比較して
            // http://blog.kazupon.jp/post/71041135220/koa

            // 3. Response Middleware
            app.Use(async (context, next) =>
            {
                Console.WriteLine(">> one");
                await next();
                Console.WriteLine("<< one");
            });

            app.Use(async (context, next) =>
            {
                Console.WriteLine(">> two");
                await context.Response.WriteAsync("two");
                await next();
                Console.WriteLine("<< two");
            });

            app.Use(async (context, next) =>
            {
                Console.WriteLine(">> three");
                await next();
                Console.WriteLine("<< three");
            });
        }
    }
}