Django nginx docker

First I apologize if this is a duplicate, but I have not found a solution through similar posts shown in SO

I have a Docker Django image that uses nginx and gunicorn.

Gunicorn script:

exec /var/www/venv/bin/gunicorn wsgi:application \
--bind 0.0.0.0:8001 \
--access-logfile /var/log/gunicorn/access.log \
--error-logfile /var/log/gunicorn/error.log

      

        
        
        
      

    

Nginx config:

server {

    server_name 172.0.0.1;

    access_log off;

    location / {
            proxy_pass http://127.0.0.1:8001;
            proxy_set_header Host $host:$server_port;
    }

    location /static/ {
        autoindex on;
        alias /var/www/django/assets/;
        expires 7d;
    }


}

      

        
        
        
      

    

I expose port 80 and map it to 49260.

When looking at the external docker IP port, including the port where the site is published and serving static files.

http://xxx.xx.xx.xxx:49260/

      

        
        
        
      

    

The problem is, when I go to any other page on the django site, the mapped port is removed from the url, which is then picked by the host server ngnix config.

What I am trying to achieve is to maintain a port in the url, which can later be overridden by the proxy from the host server.

Any advice would be really appreciated.