Originally Posted by Nathan

Yes, so now you have to at the same time you wrap track.php also wrap signup.php ... to achive anything effective. Means, to make it transparent you also have to implement your own cascading system that works like NATS does or a webmaster (or us btw) could see you messing with the system at that end.

So now you have 2, no 3 points of failure of your great shaving wrapper around NATS, which are all prone for us to detect you doing something weird with the traffic.