Undefined Constants & PHP 8

I have not had a problem with your plugin yet, but I’ve been tracking down PHP 8 upgrade troubles with some other plugins due to “undefined constants” causing fatal errors. Example: $_SERVER[REQUEST_URI] throws a fatal error, as PHP 7 would implicitly convert REQUEST_URI to a constant, but PHP 8 won’t.

I noticed your Class_rf.php file had a few of these (as well as a couple occurrences of $_SERVER[HTTP_HOST]).

Are you planning on changing these to $_SERVER[‘REQUEST_URI’] at some point?

Thanks!