Other approaches seemed to be heuristics that broke down in edge cases:
a timeout wasn't guaranteed if your JS was slow; page.load in PhantomJS
wasn't firing reliably because of long polling.
Until I made this I always got only ```<head/>``` with it's content, ```<body>``` was empty.
It seems setInterval script was finished earlier then url content was loaded to the page. Maybe because I have subscriptions with response time lower then 100ms so they were ready very quickly — database server in the same data center.
http://phantomjs.org/api/webpage/method/open.html
