code: @Override
      public ServletOutputStream getOutputStream() throws IOException {
  
          if(_out == null ){
              //create the outputstream 
              _out = new SRTUpgradeOutputStream31();       
              _outbb = new UpgradeOutputByteBufferUtil(this);
              _out.init(_outbb,_req);
          }
          return _out;
      }
docs: /*
  (non-Javadoc)
  
  @see javax.servlet.http.WebConnection#getOutputStream()