How to set the user agent string in the phantom module? - node.js

Question

var phantom = require('phantom');
console.dir(phantom);
phantom.create(function(browser){
browser.createPage(function(page){
page.customHeaders={
"HTTP_USER_AGENT": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.71 Safari/537.36",
};
console.dir(page.settings);
//undefined
page.settings={};
page.settings.userAgent = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.71 Safari/537.36';
page.settings.HTTP_USER_AGENT = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.71 Safari/537.36';
console.dir(page.settings);
page.open('http://example.com/req.php', function() {
setTimeout(function() {
var output = page.evaluate(function() {
return document;
});
console.dir(output);
//undefined
}, 1000);
});});});
when I use phantomjs I try and set the header for userAgent using three different ways but when I visit the page and save the PHP $_SERVER object to a txt pad I still see PhantomJS
HTTP_USER_AGENT: Mozilla/5.0 (Unknown; Linux x86_64) AppleWebKit/538.1 (KHTML, like Gecko) PhantomJS/2.0.1-development Safari/538.1
not only that but the output of the page is also undefined.
It seems that the docs have changed or I cant find the correct ones. I am looking at
http://phantomjs.org/api/webpage/property/settings.html
https://www.npmjs.com/package/phantom
How is this used correctly?

Answer 1

According to the Functional Details in the docs, you have to set the user agent through page.set():
page.set('settings.userAgent', 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.71 Safari/537.36');
It has to be done this way, because the bridge has to communicate with the PhantomJS process and isn't doing this in a non-asynchronous fashion. This could've probably been implemented with Object.defineProperty.
If you want to set multiple settings at once, you can do (ref):
page.set('settings', {
userAgent: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.97 Safari/537.11",
javascriptEnabled: false,
loadImages: false
});
You can find a list of settings that you can set in page.settings.

Answer 2

Currently [ 27.01.2018 ], with these requirements:
phantom: ^4.0.12,
webpage: ^0.3.0
i use this method to set up this property:
page.setting(key, value);
I checked it out with php in $_SERVER array. It works correctly.
Сompletely code looks like this:
const phantom = require('phantom');
(async function() {
const instance = await phantom.create();
const page = await instance.createPage();
page.setting('userAgent',"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.97 Safari/537.11");
await page.on('onResourceRequested', function(requestData) {
//Dump request settings to view result of our changes:
console.info('Requesting', requestData);
});
const status = await page.open('https://stackoverflow.com');
const content = await page.property('content');
//console.log(content);
await instance.exit();
})();