code: int guessPayloadLength() {
      int length = 0;
      // Total guess at average size of map entry
      try {
        Map<String,Object> payload = getBodyMap();
        length = payload.size()*60;
      }
      catch (UnsupportedEncodingException e) {
        // No FFDC code needed
        // hmm... how do we figure out a reasonable length
      }
      return length;
    }
docs: /*
  Provide an estimate of encoded length of the payload