Although deployments and migrations of React apps (and other apps that need a more customizable webserver) are fast and comfortable with Buckets, we don’t recommend using them for production websites. The drawback of this handle-404-with-index.html is of course the returned 404 HTTP code in the header, which can mess up the SEO pretty badly. You could possibly rewrite the app router code to enforce the http header code to 200 when it renders the proper page. Or – use it for the continuous deployment of administration CMS or anything similar that is not meant for the general public.