Proxy server, serve transformed HTML

index.js

var Transform = require('readable-stream/transform.js');

function serveTransformedHTML (httpRequest, httpResponse) {
    var remoteRequest, transform, remoteURL;
    console.log("transforming: " + httpRequest.url);

    transform = new Transform();
    transform._transform = function (chunk,
                                     outputFunction,
                                     callback) {
        var chunkString, chunkBuffer;

        chunkString = chunk.toString();
        chunkString = chunkString.replace('</body>',
            '<script src="/js/debug.js"></script></body>');
        chunkBuffer = new Buffer(chunkString);

        outputFunction(chunkBuffer);
        callback();
    };

    remoteURL = 'http://' + remoteHost + httpRequest.url;
    remoteRequest = request(remoteURL);
    remoteRequest.pipe(transform)
    transform.pipe(httpResponse);
};