Proxy Transforming HTML Documents on the Fly

proxy.js

var http = require('http');
var cheerio = require('cheerio');

http.createServer(function (req, res) {
    console.log(req.url);
    http.get(req.url, function (r) {
        r.setEncoding('utf-8');
        var content = '';
        r.on('data', function (chunk) {
            content += chunk;
        });
        r.on('end', function () {
            var $ = cheerio.load(content);
            var title = $('h1').text();
            $('head').append('<meta name="title" content="' + title + '"/>');
            res.end($.html());
        });
    }, function (err) {
        console.error(err);
    });
}).listen(8000);