ETag:         "\"" + etag + "\"",
		LastModified: amztime.ISO8601Format(lastModified.UTC()),
	}
}

// generates InitiateMultipartUploadResponse for given bucket, key and uploadID.
func generateInitiateMultipartUploadResponse(bucket, key, uploadID string) InitiateMultipartUploadResponse {
	return InitiateMultipartUploadResponse{
		Bucket:   bucket,
		Key:      key,
		UploadID: uploadID,
	}
}

	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)