Twitter firehose client in nodejs

gistfile1.js

// Twitter firehose client.
// Written by TJ Hunter
// https://dev.twitter.com/docs/api/1/post/statuses/filter

var https   = require('https');

// Command line args
var username = process.argv[2];
var password = process.argv[3];
var keyword  = process.argv[4] || "zombie";

if (!username || !password) {
	console.log("Usage: node twitterhose.js <twitter_username> <twitter_password> <keyword>");
	return;
}

// Authentication Headers for Twitter
var auth = new Buffer(username + ':' + password).toString('base64');
var headers = {
	'Authorization' : "Basic " + auth,
	'Host'          : "stream.twitter.com"
};

// Connection to Twitter's streaming API
var requestOptions = {
	host: 'stream.twitter.com',
	port: 443,
	path: '/1/statuses/filter.json?track=' + keyword,
	method: 'GET',
	headers: headers
};

var message = "";
var req = https.request(requestOptions, function(res){
	res.setEncoding('utf8');
	res.on('data', function(chunk){
		message += chunk;
		var newlineIndex = message.indexOf('\r');
		if (newlineIndex !== -1) {
			try {
				var tweet = JSON.parse(message.slice(0, newlineIndex)); // more info about the tweet object can be found at https://dev.twitter.com/docs/platform-objects/tweets
				console.log('<@' + tweet.user.screen_name + '> ' + tweet.text);
			} catch (e) {
			}
		}
		message = message.slice(newlineIndex +1);
	});
});

req.end();

req.on('error', function(e) {
  console.error(e);
});