Imports github.com/ampproject/amppackager/packager/util github.com/ampproject/amppackager/packager/mux github.com/WICG/webpackage/go/signedexchange/certurl github.com/gofrs/flock github.com/pkg/errors github.com/pquerna/cachecontrol golang.org/x/crypto/ocsp Standard library imports bytes context crypto/x509 encoding/base64 io io/ioutil log net/http net/url os runtime strconv sync time