1) Setup an environment that is served over multiple domain names at the same time, eg oldurl.localhost and newurl.localhost 2) Set $CFG->debug = (E_ALL | E_STRICT); to show the full x-redirect headers 3) Configure Moodle to use the 'new' url eg $CFG->wwwroot = 'https://newurl.localhost'; 4) Curl a deep link inside moodle which has both path info and query params using the oldurl eg curl -I --insecure https://oldurl.localhost/my/courses.php/path_info?query=param HTTP/1.1 303 See Other Server: nginx/1.18.0 (Ubuntu) Date: Mon, 05 Feb 2024 05:15:57 GMT Content-Type: text/html; charset=UTF-8 Connection: keep-alive X-Powered-By: PHP/8.1.2-1ubuntu2.14 X-Redirect-By: Moodle /lib/setuplib.php:964 Location: https://newurl.localhost/my/courses.php/path_info?query=param Content-Language: en 5) Confirm that you see the X-Redirect-By which means the redirect was served by Moodle and not by nginx / apache 6) Confirm that you see the same path and query string as the original request in the Location header eg: Location: https://newurl.localhost/my/courses.php/path_info?query=param