Listen on HTTP and HTTPS for a single express app

Can I create an Express server listening on both HTTP and HTTPS, with the same routes and the same middlewares?

Currently I do this with Express on HTTP, with stunnel tunneling HTTPS to Express, but I prefer a pure Node solution.

I can do it with this code, but using the handle method that is marked as private:

var express = require( 'express' )
    , https = require("https")
    , fs = require( 'fs' );

var app = express.createServer();
// init routes and middlewares
app.listen( 80 );

var privateKey = fs.readFileSync( 'privatekey.pem' ).toString();
var certificate = fs.readFileSync( 'certificate.pem' ).toString();
var options = {key: privateKey, cert: certificate};
https.createServer( options, function(req,res)
{
    app.handle( req, res );
} ).listen( 443 );