return err
	}
	switch {
	case hasPrefix(key, attrRequestHeader):
		return validateMapKey(key)
	case isEqual(key, attrSrcIP):
		return ValidateIPs(values)
	case isEqual(key, attrRemoteIP):
		return ValidateIPs(values)
	case isEqual(key, attrSrcNamespace):
	case isEqual(key, attrSrcPrincipal):
	case isEqual(key, attrRequestPrincipal):
	case isEqual(key, attrRequestAudiences):