How to get a complete and static list of all categories?

I’d like to show a list of all used categories next to the AgendaList as a kind of filter for the user. But when you have ?category=X $GET in the URL, AgendaCategories only show category X and not the complete list.

How can I get a list that is unaffected by any URL-Parameters?

Please fill the allowedRequestKeys property with something that does not contain ‘category’. Maybe I should add a deniedRequestKeys property, but whitelisting covers this too.

Ah, OK. I tried setting &allowedRequestKeys=`` before, but that had no effect. But with an arbitrary value it works! Thanks!

Maybe I should prefill it with the default value