notfound not called

notfound.js

var http = require('http')
  , director = require('director')
  , PORT = process.env.port || 8000

var routes = { 
  '/hello': {
    get: function(route) { this.res.end('/hello') }
  }
}
var routerOptions = { notfound: notFound }
var router = new director.http.Router(routes).configure(routerOptions)
var server = http.createServer(function(req, res) {
  router.dispatch(req, res)
})
// strangely, this does not work:
// http.createServer(router.dispatch)

// called when no route matches, like for static files!
function notFound(req, res) {
  console.log('notFound entered!');
  req.end('yay, notFound was called!')
}

server.listen(PORT)
console.log('Listening on http://localhost:'+PORT)

solution:

var server = http.createServer(function (req, res) {
  router.dispatch(req, res, function(err) {
    if (err) console.log(err);
    notFound(req, res)
  })
})