code: @Override
    public FDSObject getObject(String bucketName, String objectName, long pos)
      throws GalaxyFDSClientException {
      return this.getObject(bucketName, objectName, null, pos);
    }
docs: range mode for getobject while not be autoReConnection
  @param bucketName The name of the bucket where the object stores
  @param objectName The name of the object to get
  @param pos        The position to start read
  @return
  @throws GalaxyFDSClientException