typesense

has anyone tried setting up multiple TS servers behind a reverse proxy on the same IP/Host, as subdirectories?

in NGNIX this works:
        location / {
         proxy_pass <http://127.0.0.1:4001>;
        }
this does not work:  (error: not found)
        location /4001 {
         proxy_pass <http://127.0.0.1:4001>;
        }

further trying to rewrite the /subdir gives error:   Forbidden - a valid `x-typesense-api-key` header must be sent.
        location /4001 {
		rewrite ^/4001/(.*)$ /$1 break;
		#or or forcing through / at the end:
                proxy_pass <http://127.0.0.1:4001/>;        		 
        }