You can control the routes for components within your app on the “Components” tab the “HTTP Routes” section. We don’t currently offer the ability to configure arbitrary redirects, though it is functionality we are considering. You should be able to make these redirects easily within the rails routing layer.

As far as reverse proxying, it’s unlikely we’ll add functionality for proxying outside the App Platform directly. I’m not familiar with the Rack::Proxy, but it looks like it could work. You could also run nginx as a service within your application using a Dockerfile. We have an example nginx Dockerfile and configuration available in our sample repos at https://github.com/digitalocean/sample-nginx. To avoid unnecessary load, I recommend keeping your existing routes for the rails application, and add new routes to nginx just for the parts you want to proxy.