At GoCardless, we've replaced ActionController with Coach for request handling while still using the rest of the rails toolset: https://github.com/gocardless/co

At GoCardless, we've replaced ActionController with Coach for request handling while still using the rest of the rails toolset: https://github.com/gocardless/coach https://github.com/gocardless/coach It has worked really well for us over the past few years.