apt-cacher-formula/apt-cacher/ng/defaults.yaml

apt_cacher_ng:
  server_address: localhost
  server_bind_address: 0.0.0.0
  server_port: 3142
  server_extra_config: 
  server_config: /etc/apt-cacher-ng/zzz_acng.conf
  server_cache_dir: /var/cache/apt-cacher-ng
  server_log_dir: /var/log/apt-cacher-ng
  user: apt-cacher-ng
  group: apt-cacher-ng
  root_group: root
  pkg: apt-cacher-ng
  service: apt-cacher-ng
  credentials: /etc/apt-cacher-ng/security.conf
  client_config: /etc/apt/apt.conf.d/80proxy
  https_proxy: DIRECT
  local_mirrors: []