Correct proxy script for html2canvas - html2canvas

Question

I'm trying to get html2render ( http://html2canvas.hertzen.com/ ) to work on my website. It works for the basic stuff - but none of the images show (as they are on a cdn.domain.com subdomain).
I've been reading up, and it seems that it doesn't like other domains out of the box. I found a couple of PHP proxy scripts:
https://github.com/brcontainer/html2canvas-php-proxy
https://github.com/adjdred/html2canvas-proxy-php
I tried to get those going, but we don't have curl enabled on this server. So, I'm resorting to writing something in Perl.
Here is what I've got so far:
use MIME::Base64;
use File::Slurp;
handle();
sub handle {
print ('Access-Control-Max-Age:' . 5 * 60 * 1000);
print ("Access-Control-Allow-Origin: *");
print ('Access-Control-Request-Method: *');
print ('Access-Control-Allow-Methods: OPTIONS, GET');
print ('Access-Control-Allow-Headers *');
print ("Content-Type: application/javascript");
#print $IN->header;
my $url = $IN->param('url');
$url =~ s|https://cdn.xxx.net|/srv/www/xxx.net/www|g;
if (-e $url) {
my $file = read_file($url);
use JSON;
my $mime_type;
if ($url =~ /\.jpe?g$/i) {
$mime_type = "image/jpg"
} elsif ($url =~ /\.png$/i) {
$mime_type = "image/png"
}
print JSON::encode_json([{
"pathinfo" => $url,
"error" => undef,
"data" => encode_base64($file),
"mime_type" => $mime_type
}]);
} else {
print "ACK!";
}
}
However, it still doesn't work :( There is little (none??) documentation on the proxy (apart from telling you that you need it in some cases!)
Can anyone share what the outputted data should look like? I tried to work it out based on the above example codes , but my PHP is a bit rusty (and I don't have a server with PHP and Curl enabled, that I can test it out on)
Thanks!

Answer 1

Ok, well not so much an answer about the proxy - but I did come across a post:
HTML2Canvas with CORS in S3 and CloudFront
In here, is shows an example of using:
useCORS: true,
... so I tried that:
html2canvas(document.body, {
useCORS: true,
onrendered: function(canvas) {
}
});
...and it works!!!!
In my instance, I was just using domain.com and cdn.domain.com as the CDN. If you are using other 3rd party CDN's, you may need to look at enabling the CORs headers.