Proxy with explicit buffering

proxy.js

var http = require('http'),
    https = require('https'),
    httpProxy = require('http-proxy');

var server = httpProxy.createServer({
    target: { host: 'graph.facebook.com', port: 443, https: true },
    changeOrigin: true },
    function (req, res, proxy) {
        console.log("Received request.");
        server.proxy.response_buffer = new Buffer('', 'utf8');
        server.proxy.response_buffer_offset = server.proxy.response_buffer.write('', 'utf8');
        proxy.proxyRequest(req, res);
});

server.proxy.on('data', function(data) {
    console.log("NEW DATA CHUNK");
    console.log(data.toString('utf8'));
    console.log("\n\n\n\n\n\n\n");
    server.proxy.response_buffer_offset = server.proxy.response_buffer.write(data.toString(), server.proxy.response_buffer_offset, 'utf8');
});

server.proxy.on('end', function() {
    //console.log(server.proxy.response_buffer.toString());
}); 

server.listen(8000);