code: function queryResource (req, res, next, dataStore) {
    let resource = new Resource(req.path);
  
    dataStore.get(resource, (err, result) => {
      if (err) {
        next(err);
      }
      else if (!result) {
        let defaultValue = getDefaultValue(res);
  
        if (defaultValue === undefined) {
          util.debug("ERROR! 404 - %s %s does not exist", req.method, req.path);
          err = ono({ status: 404 }, "%s Not Found", resource.toString());
          next(err);
        }
        else {
          // There' a default value, so use it instead of sending a 404
          util.debug(
            "%s %s does not exist, but the response schema defines a fallback value.  So, using the fallback value",
            req.method, req.path
          );
          res.swagger.lastModified = new Date();
          res.body = defaultValue;
          next();
        }
      }
      else {
        res.swagger.lastModified = result.modifiedOn;
  
        // Set the response body (unless it's already been set by other middleware)
        res.body = res.body || result.data;
        next();
      }
    });
  }
docs: Returns the REST resource at the URL.
  If there's no resource that matches the URL, then a 404 error is returned.
  
  @param   {Request}   req
  @param   {Response}  res
  @param   {function}  next
  @param   {DataStore} dataStore