10.2 Server Proxy Cache User Authentication

I’ve got a proxy cache setup on a machine running 10.2.8 server.

Is there a quick & simple, down & dirty way to add user authentication to the built-in proxy cache without using a 3rd party cache such as Squid?

I’ve skimmed through the articles on this site but haven’t found an answer to this particular question. (Unless I can do this with an .htaccess/.htpasswd addition of some sort.)

Thanks,
Brian