How i can translate uppercase to lowercase letters in a rewrite rule in nginx web server?

Question

I need to translate the address:

www.example.com/TEST in ---> www.example.com/test

Answer 1

location /dupa/ {
    set_by_lua $request_uri_low "return ngx.arg[1]:lower()" $request_uri;
    rewrite ^ https://$host$request_uri_low;
}