express enable http and https to view a same website.

express_http_https.js

/**
 * Module dependencies.
 */

var express = require('express')
    , routes = require('./routes')
    , user = require('./routes/user')
    , http = require('http')
    , https = require('https')
    , path = require('path');

var app = express();

app.configure(function () {
    app.set('port', process.env.PORT || 3000);
    app.set('httpsport', process.env.HTTPSPORT || 443);

    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade');
    app.use(express.favicon());
    app.use(express.logger('dev'));
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(app.router);
    app.use(require('less-middleware')({ src:__dirname + '/public' }));
    app.use(express.static(path.join(__dirname, 'public')));
});

app.configure('development', function () {
    app.use(express.errorHandler());
});

app.get('/', routes.index);
app.get('/users', user.list);

var fs = require('fs');

// Setup some https server options
var https_options = {
    key:fs.readFileSync('/etc/ssl/self-signed/server.key'),
    cert:fs.readFileSync('/etc/ssl/self-signed/server.crt')
};
http.createServer(app).listen(app.get('port'), function () {
    console.log("Express server listening on port " + app.get('port'));
});

https.createServer(https_options, app).listen(app.get('httpsport'), function () {
    console.log("Express server listening on port " + app.get('httpsport'));
});

for linux user , you should use admin account to boot express app

such as for ubuntu user:

sudo node app.js