Quick node.js http "service" with low dependencies for sending serial code

gistfile1.js

var serialport = require('node-serialport');
var http = require('http');
var path = require('path');

console.log('loaded sp');

var port = '/dev/ttyO3';

console.log('opening' + port);

var sp = new serialport.SerialPort(port, {baud: 9600});

sp.on('open', function() {
      console.log('opened');
      http.createServer(function(req, res) {
        var fileName = path.basename(req.url);
        res.writeHead(200, {'Content-Type': 'text/html'});
        sp.write(fileName);
        res.end('WOOT - ' + fileName);
    }).listen(3000);
      
});