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