code: public List<String> descriptionsForResponseIDs(List<String> _ids, boolean payload, boolean pretty) {
      List<String> descriptions = new ArrayList<String>();
  
      for (ServiceWrapper s : _cache) {
        if (_ids.isEmpty() || _responseIds.contains(s.getResponseId())) {
          StringBuffer buf = serviceDesciption(payload, pretty, s);
          descriptions.add(buf.toString());
        }
      }
  
      return descriptions;
    }
docs: Return the list of description strings for a list of response ids.
  
  @param _ids list of response ids
  @param payload print the whole payload
  @param pretty make it pretty
  @return the string of all the specified response payloads