if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
	} else {
		rc = io.NopCloser(bytes.NewReader([]byte{}))
	}

	defer rc.Close()

	if err = setObjectHeaders(ctx, w, fileObjInfo, nil, opts); err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}
	// s3zip does not allow ranges
	w.Header().Del(xhttp.AcceptRanges)

	if strings.Contains(objInfo.ETag, "-") && len(objInfo.Parts) > 0 {
		w.Header()[xhttp.AmzMpPartsCount] = []string{strconv.Itoa(len(objInfo.Parts))}
	}
}

// Write object header
func setObjectHeaders(ctx context.Context, w http.ResponseWriter, objInfo ObjectInfo, rs *HTTPRangeSpec, opts ObjectOptions) (err error) {
	// set common headers
	setCommonHeaders(w)

	// Set last modified time.

		// AWS S3 silently drops checksums on range requests.
		hash.AddChecksumHeader(w, objInfo.decryptChecksums(opts.PartNumber, r.Header))
	}

	if err = setObjectHeaders(ctx, w, objInfo, rs, opts); err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// Set Parts Count Header
	if opts.PartNumber > 0 && len(objInfo.Parts) > 0 {