GetSimple CMS on Caddy server with Fancy url

[krlllo]

I got getsimple setup on Caddy server V2, but it only works with regular url expression index.php?id=/page and when I change it to Fancy url ON, the link on the page changes, but the content of the page does not change.

I have created a thread on the Caddy forum https://caddy.community/t/how-to-overrid...ache/18052 
and was told that I should change my PHP app to read from

Code:

$_SERVER['REQUEST_URI']

But I don't know what or where to change exactly.