code: @DoesServiceRequest
      public final void downloadRange(final long offset, final Long length, final OutputStream outStream)
              throws StorageException {
          this.downloadRange(offset, length, outStream, null /* accessCondition */, null /* options */, null /* opContext */);
      }
docs: Downloads the contents of a file to a stream.
  
  @param offset
  A <code>long</code> which represents the offset to use as the starting point for the source.
  @param length
  A <code>Long</code> which represents the number of bytes to read or <code>null</code>.
  @param outStream
  An <code>{@link OutputStream}</code> object that represents the target stream.
  @throws StorageException
  If a storage service error occurred.