func (o ObjectInfo) GetActualSize() (int64, error) {
	if o.ActualSize != nil {
		return *o.ActualSize, nil
	}
	if o.IsCompressed() {
		sizeStr := o.UserDefined[ReservedMetadataPrefix+"actual-size"]
		if sizeStr != "" {
			size, err := strconv.ParseInt(sizeStr, 10, 64)
			if err != nil {
				return -1, errInvalidDecompressedSize
			}
			return size, nil
		}
		var actualSize int64

	case authTypeStreamingSigned, authTypeStreamingSignedTrailer, authTypeStreamingUnsignedTrailer:
		if sizeStr, ok := r.Header[xhttp.AmzDecodedContentLength]; ok {
			if sizeStr[0] == "" {
				writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingContentLength), r.URL)
				return
			}
			size, err = strconv.ParseInt(sizeStr[0], 10, 64)
			if err != nil {
				writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
				return