How to make nginx use request port for try_files redirect?

I have nginx listening on port 80 in a docker container which maps the port to 8080.

When I go to http://example.com:8080/test nginx redirects me to http://example.com/test/ while I would expect it to be http://example.com:8080/test/.

Nginx configuration:

server {
  listen 80;
  location /test {
    try_files $uri $uri/ /test.html;
  }
}

How do I make nginx use the request origin to make the redirect?