code: public void putPayloads(List<ByteBuffer> payloads, int size) {
          putInt(size);
          if (_payloads == null) {
              _payloads = payloads;
          } else {
              _payloads.addAll(payloads);
          }
          _payloadsSize += size;
  
      }
docs: add payloads, more than one can be added.
  
  @param payloads
  @param size