Action Pack -- From request to response

Action Pack is a framework for handling and responding to web requests.
It provides mechanisms for *routing* (mapping request URLs to actions),
defining *controllers* that implement actions, and generating responses.
In short, Action Pack provides the controller layer in the MVC paradigm.

It consists of several modules:

* Action Dispatch, which parses information about the web request, handles
  routing as defined by the user, and does advanced processing related to
  HTTP such as MIME-type negotiation, decoding parameters in POST, PATCH,
  or PUT bodies, handling HTTP caching logic, cookies and sessions.

* Action Controller, which provides a base controller class that can be
  subclassed to implement filters and actions to handle requests.
  The result of an action is typically content generated from views.

With the Ruby on Rails framework, users only directly interface with the
Action Controller module.  Necessary Action Dispatch functionality is
activated by default and Action View rendering is implicitly triggered by
Action Controller.  However, these modules are designed to function on their
own and can be used outside of Rails.

This is for Ruby on Rails 7.1.