I had to tell our main_nginx that it is "reddthat.com".
services:
proxy:
image: docker.io/library/nginx
...etc...
networks:
default:
lemmy_internal:
aliases:
- reddthat.com
Now its: {user} -> CF -> {server_nginx} -> {frontend_nginx} -> mlmym => ((docker internal network)) -> {main_nginx} -> {{lemmy-ui/api}}
Instead of: {user} -> CF -> {server_nginx} -> {frontend_nginx} -> mlmym => CF -> {main_nginx} -> {{lemmy-ui/api}}