return
		}

		for k, v := range srcInfo.UserDefined {
			if stringsHasPrefixFold(k, ReservedMetadataPrefixLower) {
				encMetadata[k] = v
			}
		}

		if err = rotateKey(ctx, oldKey, newKeyID, newKey, srcBucket, srcObject, encMetadata, kmsCtx); err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}