Debugging URL parameters

Is there a method for debugging URL parameters? In the process of chasing down a rendering bug on Chrome, I unintentionally did something that broke the uri params necessary for the simplesearch plugin, eg. query:something returns a 404.

Has anyone had the issue before? Apache and Grav logs are clean.

Oddly this was because a reformat of system.yaml had left out param_sep: ';', but this time this did not yield any error from Apache.

Glad you got it sorted. That ; separator is only needed on certain windows/apache setups.

Gotten used to keeping it there for development, but in fixing some errors in the language-setup it got lost between development, testing, and deployment.