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Rails 5.0 default server puma web server. following commit - https://github.com/rails/rails/commit/ae48ea69

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Still more to do. Please assist!

`redirect_to :back` is a somewhat common pattern in Rails apps, but it
is not completely safe. There are a number of circumstances where HTTP
referrer information is not available on the request. This happens often
with bot traffic and occasionally to user traffic depending on browser
security settings.

When there is no referrer available on the request, `redirect_to :back`
will raise `ActionController::RedirectBackError`, usually resulting in
an application error.

`redirect_back` takes a required `fallback_location` keyword argument
that specifies the redirect when the referrer information is not
available.  This prevents 500 errors caused by
`ActionController::RedirectBackError`.

AbstractRequest has been deprecated, updating to refer to ActionDispatch::Request instead.

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typo "description not clear corrected with proper description and action_controller_overview file Rails' ->  Rails" [ci skip]

Followup to #20637.

- Changed `IN` to `ON` in all note sentences in guides.

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References #18148.

This pattern is too problematic and introduces a lot of edge cases:

  * On 4.2, the issue https://github.com/rails/rails/issues/15124 is
    back again.
  * needs to define each action for each http status otherwise the
    router raises ActionController::RoutingError (No route matches).
  * If the router has `match "/*username",...` and some action is
    missing, Rails will pick up the "match" and try to do its job.
  * encourages people to copy & paste programming. Not DRY.

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Using `get` results in an unexpected error page(returning empty body) for requests of other HTTP mehtods other than GET. Use `match ..., via:
:all` so the exceptions app can be more stable.

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Inheriting `ApplicationController` often causes an issue as it always
has before/after actions. It should encourage to use `ActionController::Base` instead.

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* Should say "sensitive" instead of "sensible"

References to ``AppName::Application` removed in favour of ``Rails.application``
as generated with a new rails 4.1 app.

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This is in the note at the end of Section 2: Controller Naming Convention.  [ci skip]

Closes #14409

* Introduces `:plain`, `:html`, `:body` render option.
* Update guide to use `render :plain` instead of `render :text`.

Also added a `cookies_serializer.rb` initializer to the app template.