That MODIFIES a viewer request, resulting in a viewer redirect. We want to keep the viewer request the same, i.e. with /api, and strip it only from the backend origin request.
The viewer request is the one you make from the client, with /api.
The origin request is the one CloudFront sends to your backend, which, without using Lambda@Edge via the origin request, will get sent as-is with the /api prefix. You have to strip it from the origin request.
If you strip /api from the viewer request, your `domain.com/api/users` request becomes a redirect to `domain.com/users` which results in a call to your frontend instead of your backend.
The example you referenced solves a completely different issue, not the one we are talking about.
