Plesk - How to hide port in Nginx forwarding / change listening port?

Question

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?

Answer 1

I'm not experienced with the nuances of Plesk, but there are two things stand out to me:

First, if your Docker container's web server is listening on 12345, then proxy_pass should be:

proxy_pass http://localhost:12345;

# Or if you're serving from a specific path

proxy_pass http://localhost:12345/foo

Second, the directive below is passing the hostname and port number to your Docker container.

proxy_set_header Host $host:$server_port;

Unless there is some other reason for this, I would just tell Nginx to forward the host name without the port number.

proxy_set_header Host $host;

Then reload nginx.