How create a server web with routes

basicServerWeb.js

var http = require('http');

var atendeRequisicao = function(request, response) { 
	response.writeHead(200, {"Content-Type": "text/html"});
	 
	if(request.url == '/')
		response.write("<h1>Home</h1>");
	else if(request.url == '/sobre')
		response.write("<h1>Sobre</h1>");
	else if(request.url == '/contato')
		response.write("<h1>Contato</h1>");
	else 
		response.write("<h1>Error</h1>");
		
	response.end(); 
} 

var server = http.createServer(atendeRequisicao);

var servidorLigou = function() { 
	console.log('Servidor Hello World rodando!'); 
}	
 
server.listen(3000, servidorLigou);