Enable cross origin requests

ajax-cross-origin.md

You can control this via HTTP header by adding Access-Control-Allow-Origin. Setting it to * will accept cross-domain AJAX requests from any domain.

Using PHP it's really simple, just add the following line into the script that you want to have access outside from your domain:

header("Access-Control-Allow-Origin: *");

or whatever methods you have available in libraries like Guzzle or Http Foundation to manage HTTP requests

Don't forget to enable mod_headers module in httpd.conf.