Imports github.com/pkg/errors github.com/mholt/caddy/caddytls github.com/mholt/certmagic go.etcd.io/etcd/client github.com/mholt/caddy github.com/cenkalti/backoff Standard library imports bytes context crypto/rand encoding/base64 encoding/json fmt io/ioutil log net/url os path strings time crypto/sha1