NGINX / Rewrite all Uppercase urls to the lowercase form

nginx.conf

# Testing with docker:
# docker run --rm -it -p 8000:80 -v $(pwd)/nginx.conf:/etc/nginx/nginx.conf nginx:stable-perl
load_module modules/ngx_http_perl_module.so;

user  nginx;
worker_processes  1;

http {
    include       /etc/nginx/mime.types;

    # Load perl module library from nginx
    perl_modules perl/lib;

    # Define a perl function
    perl_set $rewrite_to_lowercase '
        sub {
            # shift will get the first argument of the functio, that will be the request
            my $r = shift;

            # Extract just the uri
            my $uri = $r->uri;
            
            # lc converts to lower case LowerCase
            $uri = lc($uri);
            
            return $uri;
        }
    ';

    server {
        listen 80 default_server;

        location ~ [A-Z] {
            set $new_request_uri $rewrite_to_lowercase;

            return 301 $scheme://$http_host$new_request_uri$is_args$args;
        }    
    }
}