code: function (req, resp) {
        if (req.url !== '/') {
          resp.writeHead(404, {
            'Content-Length': 0,
            'Content-Type': 'text/plain'
          });
          resp.end();
          return;
        }
  
        // 200, success, always
        resp.writeHead(200, {'Content-Type': 'text/html'});
        // run the primer with cb
        primer(resp.end.bind(resp));
      }
docs: middleware to spit out 404 (in case a non existing ressource is request) or to process the `non static` requests