res, err := newMultipartUpload(ctx, bucket, object, opts)
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	response := generateInitiateMultipartUploadResponse(bucket, object, res.UploadID)
	if res.ChecksumAlgo != "" {
		w.Header().Set(xhttp.AmzChecksumAlgo, res.ChecksumAlgo)
		if res.ChecksumType != "" {
			w.Header().Set(xhttp.AmzChecksumType, res.ChecksumType)