A path redirect may contain any and all parts of a url which have different
escaping rules for each part. This commit tries to escape each part correctly
by splitting the string into three chunks - path (which may also include a host),
query and fragment; then it applies the correct escape pattern to each part.

Whilst using `URI.parse` would be better, unfortunately the possible presence
of %{name} parameters in the path redirect string prevents us from using it so
we have to use a regular expression instead.

Fixes #13110.

This commit makes it really easy to debug errors due to typos like
"assert_response :succezz".

This reverts commit 5a19346d, reversing
changes made to d82588ee.

This argument is being used in the view
https://github.com/rails/rails/blob/5a19346d2855ecb1c791cdef3af92589566d00db/actionpack/lib/action_dispatch/journey/visualizer/index.html.erb#L4

It is being set using the binding
https://github.com/rails/rails/blob/5a19346d2855ecb1c791cdef3af92589566d00db/actionpack/lib/action_dispatch/journey/gtg/transition_table.rb#L108

This commit fixes formatting issue for `rake routes` task, when a section is shorter than a header.

Only set the value once after it's calculated.

Revert "Used Yield instead of block.call" -- this causes all of atom_feed_helper_test.rb to fail with "SystemStackError: stack level too deep".

This reverts commit d3a1ce1c.

According to our guideline, we leave 1 space between `#` and `=>`, so we
want `# =>` instead of `#=>`.

Thanks to @fxn for the suggestion.

[ci skip]

Ruby 1.8 legacy. Since 1.9 hash preserves insertion order. No need for additional array to achieve this

constant.

`view_assigns` can use the precalculated sets and remove instance
variables without allocating any extra arrays

JSON.{dump,generate} offered by the JSON gem is not compatiable with
Rails at the moment and can cause a lot of subtle bugs when passed
certain data structures. This changed all direct usage of the JSON gem
in internal Rails code to always go through AS::JSON.{decode,encode}.

We also shouldn't be implementing `to_json` most of the time, and
these occurances are replaced with an equivilent `as_json`
implementation to avoid problems down the road.

See [1] for all the juicy details.

[1]: intridea/multi_json#138 (comment)

These errors occur when, there routes are wrongly defined.

example, the following line would cause a missing :action error

    root "welcomeindex"

Mostly beginners are expected to hit these errors, so lets improve the error message a bit to make their learning experience bit better.

This reverts commit c2b5a8e6, reversing
changes made to 1918b12c.

See: https://github.com/rails/rails/pull/9660#issuecomment-27627493

Fixes a typo in the description for the call class method in Responder.

Same as 4d4ff531

This increase the readability within the rescue block.

After this fix application config become available when calling helper outisde of view

config/application.rb

    #...
    config.asset_host = 'http://mycdn.com'
    #...

Somewhere else

    ActionController::Base.helpers.asset_path('fallback.png')
    # => http://mycdn.com/assets/fallback.png

Example:
    # application routes.rb
    mount BlogEngine => '/blog'

    # engine routes.rb
    get '/admin' => redirect('admin/dashboard')

This now redirects to the path `/blog/admin/dashboard`, whereas before it
would've generated an invalid url because there would be no slash between
the host name and the path. It also allows redirects to work where the
application is deployed to a subdirectory of a website.

Fixes #7977