var http = require("http");

var serv = http.createServer(

  function (req, res) {
    console.log("ping !");
    res.writeHead(200, { "Content-Type": "text/plain" });
    res.write("Hello world !");

    res.end();
  }
);

serv.listen(8080);

console.log("Server running at http://localhost:8080");