Restrict access to Node.js-based HTTP server by IP address

I’m not sure how bulletproof is this approach, but here it is, collected from answers around the web:

var http = require('http');
http.createServer(function (req, res)
{
    var ip = req.ip || req.connection.remoteAddress || req.socket.remoteAddress || req.connection.socket.remoteAddress;
    if (ip == '127.0.0.1') // exit if it's a particular ip
        res.end();
...

Please, someone more proficient in node – correct me