[JkWhoSaysNi]

The problem with using an external server is that the latency between the player and the server (or the player and another player) will not be accurately calculated because it will include the latency between the graal server and the web server.

This is the route it's taking

Player A requests latency of Player B to graal server
player a -> graal server
graal server -> player b
player b -> graal server
graal server -> web server

Really you need to do it in a single hop. Now, you could make a connection between the player and the webserver but that will get you the latency between the player and the webserver.

Really the only possible way to do it would be to create a socket connection between the player and the server.