Imports github.com/go-acme/lego/log github.com/go-acme/lego/acme github.com/go-acme/lego/challenge github.com/go-acme/lego/acme/api github.com/go-acme/lego/certcrypto Standard library imports crypto/x509/pkix crypto/rsa crypto/sha256 crypto/tls encoding/asn1 fmt net net/http strings