Changelog for Falcon 1.0.0
==========================

Breaking Changes
----------------
- The deprecated global hooks feature has been removed.
  :class:`~falcon.API` no longer accepts `before` and `after`
  kwargs. Applications can work around this by migrating any logic
  contained in global hooks to reside in middleware components instead.
- The middleware method :meth:`process_resource` must now accept
  an additional `params` argument. This gives the middleware method an
  opportunity to interact with the values for any fields defined in a
  route's URI template.
- The middleware method :meth:`process_resource` is now skipped when
  no route is found for the incoming request. This avoids having to
  include an ``if resource is not None`` check when implementing this
  method. A sink may be used instead to execute logic in the case that
  no route is found.
- An option was added to toggle automatic parsing of form params. Falcon
  will no longer automatically parse, by default, requests that have the
  content type "application/x-www-form-urlencoded". This was done to
  avoid unintended side-effects that may arise from consuming the
  request stream. It also makes it more straightforward for applications
  to customize and extend the handling of form submissions. Applications
  that require this functionality must re-enable it explicitly, by
  setting a new request option that was added for that purpose, per the
  example below::

        app = falcon.API()
        app.req_options.auto_parse_form_urlencoded = True

- The :class:`~falcon.HTTPUnauthorized` initializer now requires an
  additional argument, `challenges`. Per RFC 7235, a server returning a
  401 must include a WWW-Authenticate header field containing at least
  one challenge.
- The performance of composing the response body was
  improved. As part of this work, the :attr:`Response.body_encoded`
  attribute was removed. This property was only intended to be used by
  the framework itself, but any dependent code can be migrated per
  the example below::

    # Before
    body = resp.body_encoded

    # After
    if resp.body:
        body = resp.body.encode('utf-8')
    else:
        body = b''

New & Improved
--------------

- A `code of conduct <https://github.com/falconry/falcon/blob/master/CODEOFCONDUCT.md>`_
  was added to solidify our community's commitment to sustaining a
  welcoming, respectful culture.
- CPython 3.5 is now fully supported.
- The constants HTTP_422, HTTP_428, HTTP_429, HTTP_431, HTTP_451, and
  HTTP_511 were added.
- The :class:`~falcon.HTTPUnprocessableEntity`,
  :class:`~falcon.HTTPTooManyRequests`, and
  :class:`~falcon.HTTPUnavailableForLegalReasons` error classes were
  added.
- The ``HTTPStatus`` class is now available directly under
  the `falcon` module, and has been properly documented.
- Support for HTTP redirections was added via a set of
  ``HTTPStatus`` subclasses. This should avoid the problem
  of hooks and responder methods possibly overriding the redirect.
  Raising an instance of one of these new redirection classes will
  short-circuit request processing, similar to raising an instance of
  :class:`~falcon.HTTPError`.
- The default 404 responder now raises an instance of
  :class:`~falcon.HTTPError` instead of manipulating the
  response object directly. This makes it possible to customize the
  response body using a custom error handler or serializer.
- A new method, :meth:`~falcon.Response.get_header`, was added to
  :class:`~falcon.Response`. Previously there was no way to check if a
  header had been set. The new :meth:`~falcon.Response.get_header`
  method facilitates this and other use cases.
- :meth:`falcon.Request.client_accepts_msgpack` now recognizes
  "application/msgpack", in addition to "application/x-msgpack".
- New :attr:`~falcon.Request.access_route` and :attr:`~falcon.Request.remote_addr`
  properties were added to :class:`~falcon.Request` for getting upstream IP
  addresses.
- :class:`~falcon.Request` and :class:`~falcon.Response` now support
  range units other than bytes.
- The :class:`~falcon.API` and
  :class:`~falcon.testing.StartResponseMock` class types can now be
  customized by inheriting from :class:`~falcon.testing.TestBase` and
  overriding the `api_class` and `srmock_class` class attributes.
- Path segments with multiple field expressions may now be defined at
  the same level as path segments having only a single field
  expression. For example::

    api.add_route('/files/{file_id}', resource_1)
    api.add_route('/files/{file_id}.{ext}', resource_2)

- Support was added to :any:`API.add_route()` for passing through
  additional args and kwargs to custom routers.
- Digits and the underscore character are now allowed in the
  :meth:`falcon.routing.compile_uri_template` helper, for use in custom
  router implementations.
- A new testing framework was added that should be more intuitive to
  use than the old one. Several of Falcon's own tests were ported to use
  the new framework (the remainder to be ported in a
  subsequent release.) The new testing framework performs wsgiref
  validation on all requests.
- The performance of setting :attr:`Response.content_range` was
  improved by ~50%.
- A new param, `obs_date`, was added to
  :meth:`falcon.Request.get_header_as_datetime`, and defaults to
  ``False``. This improves the method's performance when obsolete date
  formats do not need to be supported.

Fixed
-----

- Field expressions at a given level in the routing tree no longer
  mask alternative branches. When a single segment in a requested path
  can match more than one node at that branch in the routing tree, and
  the first branch taken happens to be the wrong one (i.e., the
  subsequent nodes do not match, but they would have under a different
  branch), the other branches that could result in a
  successful resolution of the requested path will now be subsequently
  tried, whereas previously the framework would behave as if no route
  could be found.
- The user agent is now instructed to expire the cookie when it is
  cleared via :meth:`~falcon.Response.unset_cookie`.
- Support was added for hooks that have been defined via
  :meth:`functools.partial`.
- Tunneled UTF-8 characters in the request path are now properly
  decoded, and a placeholder character is substituted for any invalid
  code points.
- The instantiation of :attr:`~falcon.Request.context_type` is now
  delayed until after all other properties of the
  :class:`~falcon.Request` class have been initialized, in case the
  context type's own initialization depends on any of
  :class:`~falcon.Request`'s properties.
- A case was fixed in which reading from :attr:`~falcon.Request.stream`
  could hang when using :mod:`wsgiref` to host the app.
- The default error serializer now sets the Vary header in responses.
  Implementing this required passing the :class:`~falcon.Response`
  object to the serializer, which would normally be a breaking change.
  However, the framework was modified to detect old-style error
  serializers and wrap them with a shim to make them compatible with
  the new interface.
- A query string containing malformed percent-encoding no longer causes
  the framework to raise an error.
- Additional tests were added for a few lines of code that were
  previously not covered, due to deficiencies in code coverage reporting
  that have since been corrected.
- The Cython note is no longer displayed when installing under Jython.
- Several errors and ambiguities in the documentation were corrected.
