PhantomJS PDF file to Base64 - node.js

Question

I'm working with PhantomJS and doing PDF Files from rendering my own website, right now works perfectly (the file is creating, everything seems just ok at localhost).
All this comes from a Post all the way from my actual server (NoseJS), i'm trying to send in response the .pdf PhantomJS made, I tried sending binary, base64 and all kind of ways I found in the web... Right now i'm converting the file to base64 in phantom and sending it to Node, Node creates the file and the file comes in blank and bigger in size (Phantom file: 15Mb, Node file: 29Mb)
My question is, does anyone know an easy way through?
My code right now:
PhantomJS:
function utf8_to_b64(str) {
return window.btoa(unescape(encodeURIComponent(str)));
}
var server = require('webserver').create();
var fs = require('fs');
var port = require('system').env.PORT || 8080; // default back to 8080
server.listen(port, function(request, response) {
if (request.method === 'POST') {
var page = new WebPage();
var objeto = request.post;
page.paperSize = {
format: 'A4',
orientation: 'portrait',
margin: '1cm'
};
page.open("http://google.com", function(status) {
if (status !== 'success') {
console.log('Unable to load the address!');
} else {
//page.render(app + '.pdf', {
page.render('prueba.pdf', {
format: 'pdf',
quality: '100'
});
var archivo = fs.open('prueba.pdf', 'r');
archivo = archivo.read();
archivo = utf8_to_b64(archivo);
console.log('done');
//fs.remove('prueba.pdf');
response.statusCode = 200;
response.headers = {
'Content-type': 'text/plain'
};
response.write(archivo);
response.close();
page.close();
//phantom.exit();
}
});
}
});
NodeJS:
request
.post('http://localhost:8080/')
.send({
app: req.body.app,
url: 'google.com'
})
.end(function(err, respond) {
console.log('post a phantom');
console.log('error: ', err);
fs.writeFile('prueba.pdf', respond.text, 'base64', function(err) {
if (err) throw err;
console.log('It\'s saved!');
});
res.json(resJSON.ok());
});
Any ideas?