https via nodejs uniquement

var config = require('./config.js');
var app = express();
var server = require('https').Server({
    key: fs.readFileSync('site.key'),
    cert: fs.readFileSync('site_public.crt'),
    ca: [fs.readFileSync('site_intermediate.crt')],
    passphrase: 'password'
}, app);
// or var server = require('https').Server(app);

app.get('/', function (req, res) {
    return res.send('online');
});
app.use(function(req, res) {
    res.status(404).render('error', {error: 'Page introuvable'});
})
server.listen(config.port, function() {
    console.log('ready to go on '+config.port);
});