Imports github.com/go-acme/lego/v3/challenge github.com/mholt/certmagic github.com/go-acme/lego/v3/challenge/tlsalpn01 github.com/caddyserver/caddy/telemetry github.com/caddyserver/caddy github.com/go-acme/lego/v3/certcrypto github.com/klauspost/cpuid Standard library imports crypto/x509/pkix crypto/elliptic crypto/rsa encoding/pem crypto/ecdsa bytes crypto/rand crypto/tls crypto/x509 fmt io io/ioutil log math/big net net/http net/url os path/filepath strings sync sync/atomic time