code: @Override
    public void write(byte []buf, int offset, int length, boolean isEnd)
      throws IOException
    {
      if (! _isPost) {
        return;
      }
  
      if (_tempStream == null) {
        _tempStream = new MemoryStream();
      }
  
      _tempStream.write(buf, offset, length, isEnd);
    }
docs: Writes a buffer to the underlying stream.
  
  @param buffer the byte array to write.
  @param offset the offset into the byte array.
  @param length the number of bytes to write.
  @param isEnd true when the write is flushing a close.