code: public void flushBuffer()
          throws IOException
      {
          if (((HttpOutputStream)_httpResponse.getOutputStream()).isClosed())
              return;
          
          if (_writer!=null)
              _writer.flush();
          if (_out!=null)
              _out.flush();
          if (_writer==null && _out==null)
              _httpResponse.getOutputStream().flush();
          if (!_httpResponse.isCommitted())
              _httpResponse.commit();
      }
docs: /* ------------------------------------------------------------