By default, OpenPanel (actually the Caddy web server) automatically redirects all HTTP requests to HTTPS if SSL is configured.
To disable this behavior for all domains:
Edit the main Caddy configuration file:
/etc/openpanel/caddy/Caddyfile
Add the following global option:
auto_https disable_redirects
Reference: https://caddyserver.com/docs/caddyfile/options#auto-https
Restart the Caddy container to apply the changes:
docker restart caddy