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*   Remove deprecated `AbstractController::Helpers::ClassMethods::MissingHelperError`
    in favor of `AbstractController::Helpers::MissingHelperError`.

    *Yves Senn*

*   Fix `assert_template` not being able to assert that no files were rendered.

    *Guo Xiang Tan*

*   Extract source code for the entire exception stack trace for
    better debugging and diagnosis.

    *Ryan Dao*

*   Allows ActionDispatch::Request::LOCALHOST to match any IPv4 127.0.0.0/8
    loopback address.

    *Earl St Sauver*, *Sven Riedel*

*   Preserve original path in `ShowExceptions` middleware by stashing it as
    `env["action_dispatch.original_path"]`

    `ActionDispatch::ShowExceptions` overwrites `PATH_INFO` with the status code
    for the exception defined in `ExceptionWrapper`, so the path
    the user was visiting when an exception occurred was not previously
    available to any custom exceptions_app. The original `PATH_INFO` is now
    stashed in `env["action_dispatch.original_path"]`.

    *Grey Baker*

*   Use `String#bytesize` instead of `String#size` when checking for cookie
    overflow.

    *Agis Anastasopoulos*

*   `render nothing: true` or rendering a `nil` body no longer add a single
    space to the response body.

    The old behavior was added as a workaround for a bug in an early version of
    Safari, where the HTTP headers are not returned correctly if the response
    body has a 0-length. This is been fixed since and the workaround is no
    longer necessary.

    Use `render body: ' '` if the old behavior is desired.

    See #14883 for details.

    *Godfrey Chan*

*   Prepend a JS comment to JSONP callbacks. Addresses CVE-2014-4671
    ("Rosetta Flash")

    *Greg Campbell*

*   Because URI paths may contain non US-ASCII characters we need to force
    the encoding of any unescaped URIs to UTF-8 if they are US-ASCII.
    This essentially replicates the functionality of the monkey patch to
    URI.parser.unescape in active_support/core_ext/uri.rb.

    Fixes #16104.

    *Karl Entwistle*

*   Generate shallow paths for all children of shallow resources.

    Fixes #15783.

    *Seb Jacobs*

*   JSONP responses are now rendered with the `text/javascript` content type
    when rendering through a `respond_to` block.

    Fixes #15081.

    *Lucas Mazza*

*   Add `config.action_controller.always_permitted_parameters` to configure which
    parameters are permitted globally. The default value of this configuration is
    `['controller', 'action']`.

    *Gary S. Weaver*, *Rafael Chacon*

*   Fix env['PATH_INFO'] missing leading slash when a rack app mounted at '/'.

    Fixes #15511.

    *Larry Lv*

*   ActionController::Parameters#require now accepts `false` values.

    Fixes #15685.

    *Sergio Romano*

*   With authorization header `Authorization: Token token=`, `authenticate` now
    recognize token as nil, instead of "token".

    Fixes #14846.

    *Larry Lv*

*   Ensure the controller is always notified as soon as the client disconnects
    during live streaming, even when the controller is blocked on a write.

    *Nicholas Jakobsen*, *Matthew Draper*

*   Routes specifying 'to:' must be a string that contains a "#" or a rack
    application.  Use of a symbol should be replaced with `action: symbol`.
    Use of a string without a "#" should be replaced with `controller: string`.

    *Aaron Patterson*

*   Fix URL generation with `:trailing_slash` such that it does not add
    a trailing slash after `.:format`

    *Dan Langevin*

*   Build full URI as string when processing path in integration tests for
    performance reasons.

    *Guo Xiang Tan*

*   Fix `'Stack level too deep'` when rendering `head :ok` in an action method
    called 'status' in a controller.

    Fixes #13905.

    *Christiaan Van den Poel*

*   Add MKCALENDAR HTTP method (RFC 4791).

    *Sergey Karpesh*

*   Instrument fragment cache metrics.

    Adds `:controller`: and `:action` keys to the instrumentation payload
    for the `*_fragment.action_controller` notifications. This allows tracking
    e.g. the fragment cache hit rates for each controller action.

    *Daniel Schierbeck*

*   Always use the provided port if the protocol is relative.

    Fixes #15043.

    *Guilherme Cavalcanti*, *Andrew White*

*   Moved `params[request_forgery_protection_token]` into its own method
    and improved tests.

    Fixes #11316.

    *Tom Kadwill*

*   Added verification of route constraints given as a Proc or an object responding
    to `:matches?`. Previously, when given an non-complying object, it would just
    silently fail to enforce the constraint. It will now raise an `ArgumentError`
    when setting up the routes.

    *Xavier Defrang*

*   Properly treat the entire IPv6 User Local Address space as private for
    purposes of remote IP detection. Also handle uppercase private IPv6
    addresses.

    Fixes #12638.

    *Caleb Spare*

*   Fixed an issue with migrating legacy json cookies.

    Previously, the `VerifyAndUpgradeLegacySignedMessage` assumes all incoming
    cookies are marshal-encoded. This is not the case when `secret_token` is
    used in conjunction with the `:json` or `:hybrid` serializer.

    In those case, when upgrading to use `secret_key_base`, this would cause a
    `TypeError: incompatible marshal file format` and a 500 error for the user.

    Fixes #14774.

    *Godfrey Chan*

*   Make URL escaping more consistent:

    1. Escape '%' characters in URLs - only unescaped data should be passed to URL helpers
    2. Add an `escape_segment` helper to `Router::Utils` that escapes '/' characters
    3. Use `escape_segment` rather than `escape_fragment` in optimized URL generation
    4. Use `escape_segment` rather than `escape_path` in URL generation

    For point 4 there are two exceptions. Firstly, when a route uses wildcard segments
    (e.g. `*foo`) then we use `escape_path` as the value may contain '/' characters. This
    means that wildcard routes can't be optimized. Secondly, if a `:controller` segment
    is used in the path then this uses `escape_path` as the controller may be namespaced.

    Fixes #14629, #14636 and #14070.

    *Andrew White*, *Edho Arief*

*   Add alias `ActionDispatch::Http::UploadedFile#to_io` to
    `ActionDispatch::Http::UploadedFile#tempfile`.

    *Tim Linquist*

*   Returns null type format when format is not know and controller is using `any`
    format block.

    Fixes #14462.

    *Rafael Mendonça França*

*   Improve routing error page with fuzzy matching search.

    *Winston*

*   Only make deeply nested routes shallow when parent is shallow.

    Fixes #14684.

    *Andrew White*, *James Coglan*

*   Append link to bad code to backtrace when exception is `SyntaxError`.

    *Boris Kuznetsov*

*   Swapped the parameters of assert_equal in `assert_select` so that the
    proper values were printed correctly.

    Fixes #14422.

    *Vishal Lal*

*   The method `shallow?` returns false if the parent resource is a singleton so
    we need to check if we're not inside a nested scope before copying the :path
    and :as options to their shallow equivalents.

    Fixes #14388.

    *Andrew White*

*   Make logging of CSRF failures optional (but on by default) with the
    `log_warning_on_csrf_failure` configuration setting in
    `ActionController::RequestForgeryProtection`.

    *John Barton*

*   Fix URL generation in controller tests with request-dependent
    `default_url_options` methods.

    *Tony Wooster*

Please check [4-1-stable](https://github.com/rails/rails/blob/4-1-stable/actionpack/CHANGELOG.md) for previous changes.