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Latest commit eba3618 Jun 24, 2017 @samphippen samphippen Add an option to silence puma in system tests.
This is motivated by our usage of system test in RSpec. Puma lazily
boots the first time a system test is used, but this causes some
unfortunate output to appear in the middle of the user's green dots. An
example of this can be seen in @derekprior's comment
[here](rspec/rspec-rails#1813 (comment)).

There are alternatives in RSpec where we attempt to intercept the puma
boot and prevent the output from being made there, but that would
involve some monkey patching. This seems like a cleaner solution.


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 by rendering views, which are templates of various formats. In short, Action Pack provides the view and controller layers 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.

Download and installation

The latest version of Action Pack can be installed with RubyGems:

$ gem install actionpack

Source code can be downloaded as part of the Rails project on GitHub


Action Pack is released under the MIT license:


API documentation is at

Bug reports can be filed for the Ruby on Rails project here:

Feature requests should be discussed on the rails-core mailing list here: