code: function getPage(url, cb) {
  
      var page = generator.page$[u.urlPath(url)];
      var getFn = page && page.get && generator['get'+page.get];
  
      if (getFn) {
        getFn(page, function() { cb(null, page); });
      }
      else {
        process.nextTick(function() { cb(null, page); });
      }
    }
docs: async page retrieval hooks generator.getxxx(page, cb) if page.get = xxx