Use security/portacl-rc to enable privileged port binding:
# portmaster security/portacl-rc
# sysrc portacl_users+=www
# sysrc portacl_user_www_tcp="http https"
# sysrc portacl_user_www_udp="https"
# service portacl enable
# service portacl start
Configure caddy to run as www:www
# sysrc caddy_user=www caddy_group=www
Note if