However, if you just try to put phpIPAM behind a reverse proxy like Traefik or Nginx Proxy Manager, you may run into an issue where when you browse to the page, it isn't loading all the stylesheets and is basically just a white page with the text on it.

It will look like the below:

If you pull up the browser console, you will see tons of mixed content errors. 

Why is this error happening when the proxy is supposed to be forwarding all traffic to SSL? Also, in Nginx Proxy Manager, I had the "force SSL" turned on for the proxy host. But, still an error.

As it turns out the resolution is quite simple. It is just an additional parameter in the Docker Compose code for the phpIPAM web container called IPAM_TRUST_X_FORWARDED=true.

phpipam-web:
    image: phpipam/phpipam-www:latest
    ports:
      - "8100:80"
    environment:
      - TZ=America/Chicago
      - IPAM_DATABASE_HOST=phpipam-mariadb
      - IPAM_DATABASE_PASS=password
      - IPAM_DATABASE_WEBHOST=%
      - IPAM_TRUST_X_FORWARDED=true
    restart: always
    volumes:
      - "/home/linuxadmin/homelabservices/phpipam/phpipam-logo:/phpipam/css/images/logo"
      - "/home/linuxadmin/homelabservices/phpipam/phpipam-ca:/usr/local/share/ca-certificates:ro"
    networks:
      - nginxproxy
    depends_on:
      - phpipam-mariadb
    container_name: phpipam-web

Once I did this I was able to refresh the page (you may need to clear your cache or check in an incognito tab) and phpIPAM loaded normally without JQUERY errors.