node.js http server

server.js

var http = require('http');

if(process.argv.length < 3) {
    console.error('Missing listen address argument');
    return;
}

var listenAddress = process.argv[2];

var server = http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.write(listenAddress);
    res.end();
});

server.listen(80, listenAddress);