No callback on HTTP response.end?

Is that normal that a function as only parameter of response.end is not called. I was expecting the same behavior as on Node .

http.createServer(function (req, res) {
      //...
      res.end(function(){
        // never called
        console.log('GET done.');
        digitalWrite(LED2,0);
      });
}

I don't find the sources of http module. But it seems to always consider first arg as data.

Is there another way to achieve this?