To have something like:

• https://sub.domain.com forward to https://192.168.1.1:8080/sub

In Custom Locations:

• Location - set to /.
• Forward Location - set to 192.168.1.1:8080/sub/.
  • It is important that there is a / at the end!

In Advanced:

location / {
    proxy_pass http://192.168.1.1:8000/custom_dir/;
}

In Advanced:

location = /{return 301 $scheme://$http_host/admin/;} 

In Advanced:

location = /{return 301 $scheme://$http_host/admin/;} 

location / {
    # Proxy!
    include conf.d/include/proxy.conf;
}