DoOWIN.ps1

pushd

md OWIN | out-null

cd OWIN

npm install express
npm install owin

Add-Type -OutputAssembly OwinHelloWorld.dll -TypeDefinition @"
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;

namespace OwinHelloWorld
{
    public class Startup
    {
        public Task Invoke(IDictionary<string, object> env)
        {
            env["owin.ResponseStatusCode"] = 200;
            ((IDictionary<string, string[]>)env["owin.ResponseHeaders"]).Add(
                "Content-Type", new string[] { "text/html" });
            StreamWriter w = new StreamWriter((Stream)env["owin.ResponseBody"]);
            w.Write("Hello, from C#. Time on server is " + DateTime.Now.ToString());
            w.Flush();

            return Task.FromResult<object>(null);
        }
    }
}
"@

$svr = @"
var owin = require('owin')
    , express = require('express');

var app = express();
app.use(express.bodyParser());
app.all('/jazz', owin('OwinHelloWorld.dll'))
app.all('/rocknroll', function (req, res) {
    res.send(200, 'Hello from JavaScript! Time on server ' + new Date());
});

app.listen(3000);
"@

$svr | Set-Content -Encoding Ascii -Path .\server.js

write-host -fore green @"

Try either:

http://localhost:3000/rocknroll
http://localhost:3000/jazz
"@
node server.js