"X-Minio-Replication-Actual-Object-Size",
	ReplicationSsecChecksumHeader,
	// Add more supported headers here.
}

// mapping of internal headers to allowed replication headers
var validSSEReplicationHeaders = map[string]string{
	"X-Minio-Internal-Server-Side-Encryption-Sealed-Key":     "X-Minio-Replication-Server-Side-Encryption-Sealed-Key",

// keys which are treated as metadata but are reserved for internal use
// and must not set by clients
func containsReservedMetadata(header http.Header) bool {
	for key := range header {
		if _, ok := validSSEReplicationHeaders[key]; ok {
			return false
		}
		if stringsHasPrefixFold(key, ReservedMetadataPrefix) {
			return true
		}
	}
	return false
}

// isHTTPHeaderSizeTooLarge returns true if the provided