Routing expression with optional query parameter

[aleksei-oecd]

I need to define a route that will activate if in uri the query parameter my_param has a certain value or this parameter is not present at all. I use expressions router (KONG_ROUTER_FLAVOR = expressions) and I've tried without success syntaxt like bellow:

http.queries.my_param == null || http.queries.my_param == "some_value"
http.queries.my_param == "" || http.queries.my_param == "some_value"

Is it possible at all ?

[chronolaw]

Currently the expression does not support null.