code: function localMiddleware (req, res, next) {
              // Tell the client what Socket.IO namespace to use,
              // trim the leading slash because the cookie will turn it into a %2F
              res.setHeader('uibuilder-namespace', node.ioNamespace)
              res.cookie('uibuilder-namespace', tilib.trimSlashes(node.ioNamespace), {path: node.url, sameSite: true})
              next()
          }
docs: This ExpressJS middleware runs when the uibuilder page loads
  @see https://expressjs.com/en/guide/using-middleware.html