==================

Features
--------

- ``FileResponse`` from ``web_fileresponse.py`` uses a ``ThreadPoolExecutor`` to work with files asynchronously.
I/O based payloads from ``payload.py`` uses a ``ThreadPoolExecutor`` to work with I/O objects asynchronously.
`3313 <https://github.com/aio-libs/aiohttp/issues/3313>`_
- Internal Server Errors in plain text if the browser does not support HTML.
`3483 <https://github.com/aio-libs/aiohttp/issues/3483>`_


Bugfixes
--------

- Preserve MultipartWriter parts headers on write.

Refactor the way how ``Payload.headers`` are handled. Payload instances now always
have headers and Content-Type defined.

Fix Payload Content-Disposition header reset after initial creation.
`3035 <https://github.com/aio-libs/aiohttp/issues/3035>`_
- Log suppressed exceptions in ``GunicornWebWorker``.
`3464 <https://github.com/aio-libs/aiohttp/issues/3464>`_
- Remove wildcard imports.
`3468 <https://github.com/aio-libs/aiohttp/issues/3468>`_
- Use the same task for app initialization and web server handling in gunicorn workers.
It allows to use Python3.7 context vars smoothly.
`3471 <https://github.com/aio-libs/aiohttp/issues/3471>`_
- Fix handling of chunked+gzipped response when first chunk does not give uncompressed data
`3477 <https://github.com/aio-libs/aiohttp/issues/3477>`_
- Replace ``collections.MutableMapping`` with ``collections.abc.MutableMapping`` to avoid a deprecation warning.
`3480 <https://github.com/aio-libs/aiohttp/issues/3480>`_
- ``Payload.size`` type annotation changed from `Optional[float]` to `Optional[int]`.
`3484 <https://github.com/aio-libs/aiohttp/issues/3484>`_
- Ignore done tasks when cancels pending activities on ``web.run_app`` finalization.
`3497 <https://github.com/aio-libs/aiohttp/issues/3497>`_


Improved Documentation
----------------------

- Add documentation for ``aiohttp.web.HTTPException``.
`3490 <https://github.com/aio-libs/aiohttp/issues/3490>`_


Misc
----

- `3487 <https://github.com/aio-libs/aiohttp/issues/3487>`_


----

====================

- Fix a regression about ``ClientSession._requote_redirect_url`` modification in debug
mode.

====================

Features
--------

- The library type annotations are checked in strict mode now.
- Add support for setting cookies for individual request (`2387 <https://github.com/aio-libs/aiohttp/pull/2387>`_)
- Application.add_domain implementation (`2809 <https://github.com/aio-libs/aiohttp/pull/2809>`_)
- The default ``app`` in the request returned by ``test_utils.make_mocked_request``
can now have objects assigned to it and retrieved using the ``[]`` operator. (`3174 <https://github.com/aio-libs/aiohttp/pull/3174>`_)
- Make ``request.url`` accessible when transport is closed. (`3177 <https://github.com/aio-libs/aiohttp/pull/3177>`_)
- Add ``zlib_executor_size`` argument to ``Response`` constructor to allow compression to run in a background executor to avoid blocking the main thread and potentially triggering health check failures. (`3205 <https://github.com/aio-libs/aiohttp/pull/3205>`_)
- Enable users to set `ClientTimeout` in `aiohttp.request` (`3213 <https://github.com/aio-libs/aiohttp/pull/3213>`_)
- Don't raise a warning if ``NETRC`` environment variable is not set and ``~/.netrc`` file
doesn't exist. (`3267 <https://github.com/aio-libs/aiohttp/pull/3267>`_)
- Add default logging handler to web.run_app

If the `Application.debug` flag is set and the default logger `aiohttp.access` is used, access logs will now be output using a `stderr` `StreamHandler` if no handlers are attached. Furthermore, if the default logger has no log level set, the log level will be set to `DEBUG`. (`3324 <https://github.com/aio-libs/aiohttp/pull/3324>`_)
- Add method argument to ``session.ws_connect()``.

Sometimes server API requires a different HTTP method for WebSocket connection establishment.

For example, ``Docker exec`` needs POST. (`3378 <https://github.com/aio-libs/aiohttp/pull/3378>`_)
- Create a task per request handling. (`3406 <https://github.com/aio-libs/aiohttp/pull/3406>`_)


Bugfixes
--------

- Enable passing `access_log_class` via `handler_args` (`3158 <https://github.com/aio-libs/aiohttp/pull/3158>`_)
- Return empty bytes with end-of-chunk marker in empty stream reader. (`3186 <https://github.com/aio-libs/aiohttp/pull/3186>`_)
- Accept ``CIMultiDictProxy`` instances for ``headers`` argument in ``web.Response``
constructor. (`3207 <https://github.com/aio-libs/aiohttp/pull/3207>`_)
- Don't uppercase HTTP method in parser (`3233 <https://github.com/aio-libs/aiohttp/pull/3233>`_)
- Make method match regexp RFC-7230 compliant (`3235 <https://github.com/aio-libs/aiohttp/pull/3235>`_)
- Add ``app.pre_frozen`` state to properly handle startup signals in sub-applications. (`3237 <https://github.com/aio-libs/aiohttp/pull/3237>`_)
- Enhanced parsing and validation of helpers.BasicAuth.decode. (`3239 <https://github.com/aio-libs/aiohttp/pull/3239>`_)
- Change imports from collections module in preparation for 3.8. (`3258 <https://github.com/aio-libs/aiohttp/pull/3258>`_)
- Ensure Host header is added first to ClientRequest to better replicate browser (`3265 <https://github.com/aio-libs/aiohttp/pull/3265>`_)
- Fix forward compatibility with Python 3.8: importing ABCs directly from the collections module will not be supported anymore. (`3273 <https://github.com/aio-libs/aiohttp/pull/3273>`_)
- Keep the query string by `normalize_path_middleware`. (`3278 <https://github.com/aio-libs/aiohttp/pull/3278>`_)
- Fix missing parameter ``raise_for_status`` for aiohttp.request() (`3290 <https://github.com/aio-libs/aiohttp/pull/3290>`_)
- Bracket IPv6 addresses in the HOST header (`3304 <https://github.com/aio-libs/aiohttp/pull/3304>`_)
- Fix default message for server ping and pong frames. (`3308 <https://github.com/aio-libs/aiohttp/pull/3308>`_)
- Fix tests/test_connector.py typo and tests/autobahn/server.py duplicate loop def. (`3337 <https://github.com/aio-libs/aiohttp/pull/3337>`_)
- Fix false-negative indicator end_of_HTTP_chunk in StreamReader.readchunk function (`3361 <https://github.com/aio-libs/aiohttp/pull/3361>`_)
- Release HTTP response before raising status exception (`3364 <https://github.com/aio-libs/aiohttp/pull/3364>`_)
- Fix task cancellation when ``sendfile()`` syscall is used by static file handling. (`3383 <https://github.com/aio-libs/aiohttp/pull/3383>`_)
- Fix stack trace for ``asyncio.TimeoutError`` which was not logged, when it is caught
in the handler. (`3414 <https://github.com/aio-libs/aiohttp/pull/3414>`_)


Improved Documentation
----------------------

- Improve documentation of ``Application.make_handler`` parameters. (`3152 <https://github.com/aio-libs/aiohttp/pull/3152>`_)
- Fix BaseRequest.raw_headers doc. (`3215 <https://github.com/aio-libs/aiohttp/pull/3215>`_)
- Fix typo in TypeError exception reason in ``web.Application._handle`` (`3229 <https://github.com/aio-libs/aiohttp/pull/3229>`_)
- Make server access log format placeholder %b documentation reflect
behavior and docstring. (`3307 <https://github.com/aio-libs/aiohttp/pull/3307>`_)


Deprecations and Removals
-------------------------

- Deprecate modification of ``session.requote_redirect_url`` (`2278 <https://github.com/aio-libs/aiohttp/pull/2278>`_)
- Deprecate ``stream.unread_data()`` (`3260 <https://github.com/aio-libs/aiohttp/pull/3260>`_)
- Deprecated use of boolean in ``resp.enable_compression()`` (`3318 <https://github.com/aio-libs/aiohttp/pull/3318>`_)
- Encourage creation of aiohttp public objects inside a coroutine (`3331 <https://github.com/aio-libs/aiohttp/pull/3331>`_)
- Drop dead ``Connection.detach()`` and ``Connection.writer``. Both methods were broken
for more than 2 years. (`3358 <https://github.com/aio-libs/aiohttp/pull/3358>`_)
- Deprecate ``app.loop``, ``request.loop``, ``client.loop`` and ``connector.loop`` properties. (`3374 <https://github.com/aio-libs/aiohttp/pull/3374>`_)
- Deprecate explicit debug argument. Use asyncio debug mode instead. (`3381 <https://github.com/aio-libs/aiohttp/pull/3381>`_)
- Deprecate body parameter in HTTPException (and derived classes) constructor. (`3385 <https://github.com/aio-libs/aiohttp/pull/3385>`_)
- Deprecate bare connector close, use ``async with connector:`` and ``await connector.close()`` instead. (`3417 <https://github.com/aio-libs/aiohttp/pull/3417>`_)
- Deprecate obsolete ``read_timeout`` and ``conn_timeout`` in ``ClientSession`` constructor. (`3438 <https://github.com/aio-libs/aiohttp/pull/3438>`_)


Misc
----

- 3341, 3351

------------------

- More aggressive typing (48)

-------------------

Backward-incompatible Changes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Fixed a bug where deserialized objects with ``cache_hash=True`` could have incorrect hash code values.
This change breaks classes with ``cache_hash=True`` when a custom ``__setstate__`` is present.
An exception will be thrown when applying the ``attrs`` annotation to such a class.
This limitation is tracked in issue `494 <https://github.com/python-attrs/attrs/issues/494>`_.
`482 <https://github.com/python-attrs/attrs/issues/482>`_


Changes
^^^^^^^

- Add ``is_callable``, ``deep_iterable``, and ``deep_mapping`` validators.

* ``is_callable``: validates that a value is callable
* ``deep_iterable``: Allows recursion down into an iterable,
 applying another validator to every member in the iterable
 as well as applying an optional validator to the iterable itself.
* ``deep_mapping``: Allows recursion down into the items in a mapping object,
 applying a key validator and a value validator to the key and value in every item.
 Also applies an optional validator to the mapping object itself.

You can find them in the ``attr.validators`` package.
`425 <https://github.com/python-attrs/attrs/issues/425>`_
- Fixed stub files to prevent errors raised by mypy's ``disallow_any_generics = True`` option.
`443 <https://github.com/python-attrs/attrs/issues/443>`_
- Attributes with ``init=False`` now can follow after ``kw_only=True`` attributes.
`450 <https://github.com/python-attrs/attrs/issues/450>`_
- ``attrs`` now has first class support for defining exception classes.

If you define a class using ``attr.s(auto_exc=True)`` and subclass an exception, the class will behave like a well-behaved exception class including an appropriate ``__str__`` method, and all attributes additionally available in an ``args`` attribute.
`500 <https://github.com/python-attrs/attrs/issues/500>`_
- Clarified documentation for hashing to warn that hashable objects should be deeply immutable (in their usage, even if this is not enforced).
`503 <https://github.com/python-attrs/attrs/issues/503>`_


----

++++++++++++++++

- Update to Unicode 11.0.0.
- Provide more specific exceptions for some malformed labels.

==================

- Allow to have more than one `[bot]` section in config file

- IrcString now allow to retrieve username/hostname from mask

------------------

* Fix another memory leak introduced by 4.5.0 release (:pr:`307`)

------------------

* Fix a memory leak introduced by 4.5.0 release (:pr:`306`)

------------------

* Multidict views ported from Cython to C extension (:pr:`275`)

------------------

- Add support for Python 3.7.

- Drop support for Python 3.3.

------------------

* Fix annotations for ``query`` parameter (207)

* An incoming query sequence can have int variables (the same as for
Mapping type) (208)

* Add ``URL.explicit_port`` property (218)

* Give a friendlier error when port cant be converted to int (168)

* ``bool(URL())`` now returns ``False`` (272)