I am working on an implementation in Apache/PHP. The first part is an internal redirect in .htaccess to a PHP script which decides what to serve. Obviously a P

I am working on an implementation in Apache/PHP. The first part is an internal redirect in .htaccess to a PHP script which decides what to serve. Obviously a PHP script is not optimal for broad use. A better implementation would be an Apache or nginx module. But PHP is handy for experimentation.