type Warning … const WarningResponseIsStale … const WarningRevalidationFailed … const WarningDisconnectedOperation … const WarningHeuristicExpiration … const WarningMiscellaneousWarning … const WarningTransformationApplied … const WarningMiscellaneousPersistentWarning … func (w Warning) HeaderString(agent string, date time.Time) string { … } func (w Warning) String() string { … }