server.js

const express = require("express");

const app1 = express();
const app2 = express();


const handler = serverName => (req, res) => {
    console.log(`Reuest from ${serverName}`, req.method, req.url);
    res.send(`Hello from server ${serverName}`);
}

// Only handle GET and POST requests, Receive request and pass to handler method
app1.get('*', handler(1)).post('*', handler(1));
app2.get('*', handler(2)).post('*', handler(2));


// Start server on PORT 3000
app1.listen(3000, err =>{
    err ?
    console.log("Failed to listen on PORT 3000"):
    console.log("Application Server listening on PORT 3000");
});
 
// Start server on PORT 3001
app2.listen(3001, err =>{
    err ?
    console.log("Failed to listen on PORT 3001"):
    console.log("Application Server listening on PORT 3001");
});