How to convert a url from Uppercase to lowercase in nginx

Question

I have written an nginx config map file for my kubernetes deployment.

apiVersion: v1
kind: ConfigMap
metadata:
  name: api-svc
  namespace: api
data:
  nginx.conf: |
    worker_processes 1;
    events { worker_connections 1024; }
    http {
        server {
            listen 80;
            server_name my.abc.com;

            location ~* ^/wservce/api {
                proxy_pass http://my.abc.com:80;
            }
        }

    }

Now when I hit my.abc.com/wservce/api it is working fine and sending the request to
http://my.abc.com:80/wservce/api
and I'm getting the response.

But when I hit my.abc.com/WseRvce/API it matches /wservce/api block because I have used ~* but the request goes to
http://my.abc.com:80/WseRvce/API
for which we have not written any rules.

I want to send the request to http://my.abc.com:80/wservce/api only even if the request comes in uppercase or lowercase.

Solutions I have tried.

1. I tried to hard code the proxy pass but it didn't work. Nginx pod went to crash loop backoff saying .

location ~* ^/wservce/api {
                proxy_pass http://my.abc.com:80/wservce/api;
            }

2. Tried this map but again it is sending request to uppercase url.

    http {
        map $request_uri $lowercase_uri {
            ~^(?i)(.*)$  $1;
        }
        server {
            listen 80;
            server_name my.abc.com;
            location ~* ^/wservce/api {
                rewrite ^ $lowercase_uri break;
                proxy_pass http://my.abc.com:80;
            }
        }

In my logs path is - Wservce/API only and gave 404.

3. Tried this also but it is sending the request to uppercase only.

location ~* ^/wservce/api {
                rewrite ~* ^/wservce/api/(.*)$ /wservce/api/$1 break;
                proxy_pass http://my.abc.com:80;
            }

In my logs path is - Wservce/API only and gave 404.

4. I don't want to use any library for this like lua.

Note : Request is directly coming to nginx there is no ingress above it.

Summary : whenever I hit a url with Uppercase letters it goes to its corresponding block but in proxy_pass it takes the url with Uppercase while I want it in lowercase.