How to enable CORS on a Wordpress Subdomain?

Question

I have a wordpress page using ajax (a room booking system), and also a wordpress subdomain which is pointing to the page.

The main section of the page will not load

Answer 1

headers are best sent out from the server itself. So if you are using apache you'd need to tell apache to send that header ideally.

http://enable-cors.org/server_apache.html