HTTP headers are configured on the server side, where the file is hosted - in your case, Google Drive.
The control is specifically there to prevent outside websites or apps (your game) from directly accessing files on the server. It is pretty much on by default for all servers, because the owners of those servers don't want people abusing their resources.
If you are the owner/admin of your own server, you can set that HTTP header to allow cross domain access in your server configuration.
Basically, if you want your app to access data online, a free file hosting service probably isn't going to cut it. You might want to look into setting up your own server, or use a service like backendless, firebase, or parse.