Imports github.com/go-acme/lego/v3/acme/api github.com/go-acme/lego/v3/certificate github.com/go-acme/lego/v3/certcrypto github.com/go-acme/lego/v3/registration github.com/go-acme/lego/v3/challenge/resolver Standard library imports crypto/tls crypto/x509 errors fmt io/ioutil net net/http net/url os time