PhantomJS SEO HTML snapshot server - for AJAX crawling / JavaScript SEO

seo-server.js

/*
 * SEO server
 *
 * Generates and serves HTML snapshots for crawlers, esp. GoogleBot.
 * See https://developers.google.com/webmasters/ajax-crawling/docs/specification
 *
 * Note: This is run by phantonjs, not node. See http://phantomjs.org
 *
 */
var system = require('system')
var webpage = require('webpage')
var webserver = require('webserver')
 
// load config
var env = (system.env.NODE_ENV == 'production') ? 'prod' : 'dev'
var conf = require('../../conf/configs')[env]
var port = conf.seo.port || 8888
var targetBaseUrl = conf.web.domain
 
var render = function(url, done) {
    var page = webpage.create()
 
    // configure headless browser
    page.settings.loadImages = false
    page.settings.localToRemoteUrlAccessEnabled = true
 
    page.onCallback = function() {
        done(null, page.content)
        page.close()
    }
 
    page.open(url, function(status) {
        if (status != 'success') {
            done(status)
            page.close()
        }
    })
}
 
// kick off the server
var server = webserver.create()
server.listen(port, function(req, res) {
    var url = req.url
 
    // only GET allowed
    if (req.method != 'GET') {
        console.error('Deny request method', req.method, url)
        res.statusCode = 405
        res.write('')
        res.close()
        return
    }
 
    var escapedFragment = /[&\?]_escaped_fragment_=([^&]*)/
    var match = url.match(escapedFragment)
    if (!match) {
        console.error('Deny request', url)
        res.statusCode = 400
        res.write('')
        res.close()
        return
    }
 
    var prettyUrl = url.replace(escapedFragment, '')
    var hashFragment = match[1] 
    if (hashFragment) {
        prettyUrl += '#!' + unescape(hashFragment)
    }
 
    var targetUrl = targetBaseUrl + prettyUrl
    console.log('Fetching', targetUrl, '(was', url + ')', req.headers['user-agent'])
 
    render(targetUrl, function(err, html) {
        if (err) {
            console.error('Failed to load page', targetUrl)
            res.statusCode = 500
            res.write('')
            res.close()
            return
        }
        res.statusCode = 200
        res.write(html)
        res.close()
        console.log('Served page', targetUrl)
    })
})
 
console.info('Listening on port', port, 'targeting', targetBaseUrl)

Nice. Just a note, I built a service that provides this functionality as well. Might be easier than running your own instances. Plus we use Firefox not PhantomJS since it allows us to stay current with the latest features of HTML5. Check it out https://snapsearch.io/

var conf = require('../../conf/configs')[env]
which one conf file defined! i did'nt understand.
please help me.