* Add `action_controller_api` and `action_controller_base` load hooks to be called in `ActiveSupport.on_load` `ActionController::Base` and `ActionController::API` have differing implementations. This means that the one umbrella hook `action_controller` is not able to address certain situations where a method may not exist in a certain implementation. This is fixed by adding two new hooks so you can target `ActionController::Base` vs `ActionController::API` Fixes #27013. *Julian Nadeau* Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/actionpack/CHANGELOG.md) for previous changes.