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