}

	if r.Header.Get(xhttp.AmzChecksumMode) == "ENABLED" && rs == nil {
		// AWS S3 silently drops checksums on range requests.
		hash.AddChecksumHeader(w, objInfo.decryptChecksums(opts.PartNumber))
	}

	var buf *bytebufferpool.ByteBuffer
	if update {
		if globalCacheConfig.MatchesSize(objInfo.Size) {
			buf = bytebufferpool.Get()
			defer bytebufferpool.Put(buf)
		}