} else if offsetEnd < 0 {
			return nil, fmt.Errorf("Last byte position is negative ('%d')", offsetEnd)
		}
	}

	switch {
	case offsetBegin > -1 && offsetEnd > -1:
		if offsetBegin > offsetEnd {
			return nil, errInvalidRange
		}
		return &HTTPRangeSpec{false, offsetBegin, offsetEnd}, nil
	case offsetBegin > -1:
		return &HTTPRangeSpec{false, offsetBegin, -1}, nil

				Description:    e.Error(),
				HTTPStatusCode: errorCodes[ErrInvalidRange].HTTPStatusCode,
				ObjectSize:     strconv.FormatInt(e.ResourceSize, 10),
				RangeRequested: fmt.Sprintf("%d-%d", e.OffsetBegin, e.OffsetEnd),
			}
		case InvalidArgument:
			apiErr = APIError{
				Code:           "InvalidArgument",
				Description:    e.Error(),
				HTTPStatusCode: errorCodes[ErrInvalidRequest].HTTPStatusCode,
			}