docs: public void commandContinuationRequest()
              throws ProtocolException {
          try {
              output.write('+');
              output.write(' ');
              output.write('O');
              output.write('K');
              output.write('\r');
              output.write('\n');
              output.flush();
          } catch (IOException e) {
              throw new ProtocolException("Unexpected exception in sending command continuation request.", e);
          }
      }