Question How to hide port in Nginx forwarding / change listening port

[jasmines]

Server operating system version

Ubuntu 22.04.3 LTS

Plesk version and microupdate number

Plesk Obsidian v18.0.56_build1800231106.15 os_Ubuntu 22.04

Hi all,

I installed the Docker extension in my Plesk Obsidian.
Then I installed a docker image that raises a web server on localhost:8443. It maps the port 8443 on a chosen target port (let's say 12345).
Then, I used the docker proxy-rule in a domain (my.domain.com) to forward 12345 to 8443 in the docker container.

Everything is working ok, if I go to https://my.domain.com:12345/ I correctly reach the web server in the container.

Now, I'd like to hide the 12345 port in the URL.

Following this: Hide port in Nginx reverse proxy redirection

I unchecked proxy mode for Nginx and added this addictional directives:

listen 443 ssl;
server_name_in_redirect off;
proxy_set_header Host $host:$server_port;
location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://localhost:32770;
}
access_log off;

But the 12345 is still in the URL... Suggestions?