get preconnectHandler() {
    const host = this.host
    const port = this.port
    return function (req, res) {
      res.json({
        payload: {
          return_value: {
            redirect_host: `${host}:${port}`,
            security_policies: {}
          }
        }
      })
    }
  }
The most basic `preconnect` handler. Useful when you do not need to
customize the handler.

@returns {function}