Phantom js cant render dynamic page for a screenshot

var page = new WebPage() 
 
 
page.customHeaders = { 
"upgrade-Insecure-Requst": "1", 
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8", 
"accept-Encoding": "gzip, deflate, sdch, br", 
"accept-Language": "ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4", 
"user-agent": "Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5355d Safari/8536.25", 
}; 
 
var fs = require('fs'); 
page.onError = function (msg, trace) { 
console.log(msg); 
trace.forEach(function(item) { 
console.log(' ', item.file, ':', item.line); 
}); 
};