Imports golang.org/x/crypto/acme golang.org/x/oauth2/google google.golang.org/api/appengine/v1beta google.golang.org/appengine google.golang.org/appengine/memcache google.golang.org/appengine/urlfetch google.golang.org/appengine/user Standard library imports context crypto/rand crypto/rsa crypto/x509 crypto/x509/pkix encoding/pem fmt net/http strings time