CoreDNS

• https://coredns.io/plugins/acl/
• https://github.com/coredns/example/blob/master/example.go
• https://github.com/miekg/local/blob/master/local.go
• https://coredns.io/2017/03/01/how-to-add-plugins-to-coredns/
• https://coredns.io/plugins/

https://coredns.io/manual/toc/

https://coredns.io/plugins/proxy/ - https://github.com/coredns/coredns/issues/2277