Serveur Http Avec listener séparé

index.js

#!/usr/bin/env node

var http = require('http');
const PORT=8080; 

function requestListener(request, response){
    response.end('Hello World');
}

var server = http.createServer();

server.on('request', requestListener);
server.on('listening', function(){
    console.log("Server listening on `http://localhost:%s`", PORT);
});

server.listen(PORT);