phantomJS method to get raw HTML from SPA

phantomBridge.js

var pjson = require('../package.json');
var log4js = require('log4js');
var sLogger = log4js.getLogger('server');

var bots = [
    '+https://developers.google.com/+/web/snippet/', // Google+
    'facebookexternalhit',
    'Googlebot'
];

var domain = pjson.domain || 'http://localhost';
module.exports = {
    /**
     * Checks whether bot is allowed.
     * @param {string} userAgent
     */
    isAllowedBot: function (userAgent) {
        var index = bots.length;
        while (index--) {
            if (userAgent.indexOf(bots[index])!== -1) {
                return true;
            }
        }
        return false;
    },
    /**
     * Fetches given url from PhantomJS headless webkit
     * @param proxy {object} proxy returned in a callback after creating a phantom proxy
     * @param url {string} url you wish to fetch
     * @param res {object} express.js response
     * @param port {number} port
     */
    getFromPhantom: function(proxy, url, res, port) {
        var url = domain + ':' + port + url;
        sLogger.info('crawler identified, booting phantom on url ' + url);
        var page = proxy.page;
        page.open(url, function () {
            page.waitForSelector('#phantomFlag', function () {
                sLogger.info('phantomflag present');
                var pageContent = null;
                page.evaluate(function () {
                    return document.getElementsByTagName('html')[0].innerHTML;
                }, function(ret){
                    pageContent = ret;
                    sLogger.info("Callback has been fired, page " + url + " was rendered in PhantomJS");
                    res.send(pageContent);
                    res.end();
                });
            });
        });
    },
    // for phantom proxy
    options: {'loadImages': 'no', 'maxDiskCache': '500000'}
};

Then you use these methods like this(express.js, phantom-proxy as dependencies):
var phantom = require('./phantomBridge.js');
phantomProxy.create(phantom.options, function (proxy) {
if (phantom.isAllowedBot(agent)) {
phantom.getFromPhantom(proxy, req.url, res, app.get('port'));
} else {
res.sendfile('./public/index.html');
}
}