==================
Features
--------
- Speed up the `PayloadWriter.write` method for large request bodies. (`2126 <https://github.com/aio-libs/aiohttp/pull/2126>`_)
- StreamResponse and Response are now MutableMappings. (`2246 <https://github.com/aio-libs/aiohttp/pull/2246>`_)
- ClientSession publishes a set of signals to track the HTTP request execution.
(`2313 <https://github.com/aio-libs/aiohttp/pull/2313>`_)
- Content-Disposition fast access in ClientResponse (`2455 <https://github.com/aio-libs/aiohttp/pull/2455>`_)
- Added support to Flask-style decorators with class-based Views. (`2472 <https://github.com/aio-libs/aiohttp/pull/2472>`_)
- Signal handlers (registered callbacks) should be coroutines. (`2480 <https://github.com/aio-libs/aiohttp/pull/2480>`_)
- Support ``async with test_client.ws_connect(...)`` (`2525 <https://github.com/aio-libs/aiohttp/pull/2525>`_)
- Introduce *site* and *application runner* as underlying API for `web.run_app`
implementation. (`2530 <https://github.com/aio-libs/aiohttp/pull/2530>`_)
- Only quote multipart boundary when necessary and sanitize input (`2544 <https://github.com/aio-libs/aiohttp/pull/2544>`_)
- Make the `aiohttp.ClientResponse.get_encoding` method public with the
processing of invalid charset while detecting content encoding. (`2549 <https://github.com/aio-libs/aiohttp/pull/2549>`_)
- Add optional configurable per message compression for
`ClientWebSocketResponse` and `WebSocketResponse`. (`2551 <https://github.com/aio-libs/aiohttp/pull/2551>`_)
- Add hysteresis to `StreamReader` to prevent flipping between paused and
resumed states too often. (`2555 <https://github.com/aio-libs/aiohttp/pull/2555>`_)
- Support `.netrc` by `trust_env` (`2581 <https://github.com/aio-libs/aiohttp/pull/2581>`_)
- Avoid to create a new resource when adding a route with the same name and
path of the last added resource (`2586 <https://github.com/aio-libs/aiohttp/pull/2586>`_)
- `MultipartWriter.boundary` is `str` now. (`2589 <https://github.com/aio-libs/aiohttp/pull/2589>`_)
- Allow a custom port to be used by `TestServer` (and associated pytest
fixtures) (`2613 <https://github.com/aio-libs/aiohttp/pull/2613>`_)
- Add param access_log_class to web.run_app function (`2615 <https://github.com/aio-libs/aiohttp/pull/2615>`_)
- Add ``ssl`` parameter to client API (`2626 <https://github.com/aio-libs/aiohttp/pull/2626>`_)
- Fixes performance issue introduced by 2577. When there are no middlewares
installed by the user, no additional and useless code is executed. (`2629 <https://github.com/aio-libs/aiohttp/pull/2629>`_)
- Rename PayloadWriter to StreamWriter (`2654 <https://github.com/aio-libs/aiohttp/pull/2654>`_)
- New options *reuse_port*, *reuse_address* are added to `run_app` and
`TCPSite`. (`2679 <https://github.com/aio-libs/aiohttp/pull/2679>`_)
- Use custom classes to pass client signals parameters (`2686 <https://github.com/aio-libs/aiohttp/pull/2686>`_)
- Use ``attrs`` library for data classes, replace `namedtuple`. (`2690 <https://github.com/aio-libs/aiohttp/pull/2690>`_)
- Pytest fixtures renaming, add ``aiohttp_`` prefix (`2578 <https://github.com/aio-libs/aiohttp/pull/2578>`_)
- Add ``aiohttp-`` prefix for ``pytest-aiohttp`` command line
parameters (`2578 <https://github.com/aio-libs/aiohttp/pull/2578>`_)
Bugfixes
--------
- Correctly process upgrade request from server to HTTP2. ``aiohttp`` does not
support HTTP2 yet, the protocol is not upgraded but response is handled
correctly. (`2277 <https://github.com/aio-libs/aiohttp/pull/2277>`_)
- Fix ClientConnectorSSLError and ClientProxyConnectionError for proxy
connector (`2408 <https://github.com/aio-libs/aiohttp/pull/2408>`_)
- Fix connector convert OSError to ClientConnectorError (`2423 <https://github.com/aio-libs/aiohttp/pull/2423>`_)
- Fix connection attempts for multiple dns hosts (`2424 <https://github.com/aio-libs/aiohttp/pull/2424>`_)
- Fix writing to closed transport by raising `asyncio.CancelledError` (`2499 <https://github.com/aio-libs/aiohttp/pull/2499>`_)
- Fix warning in `ClientSession.__del__` by stopping to try to close it.
(`2523 <https://github.com/aio-libs/aiohttp/pull/2523>`_)
- Fixed race-condition for iterating addresses from the DNSCache. (`2620 <https://github.com/aio-libs/aiohttp/pull/2620>`_)
- Fix default value of `access_log_format` argument in `web.run_app` (`2649 <https://github.com/aio-libs/aiohttp/pull/2649>`_)
- Freeze sub-application on adding to parent app (`2656 <https://github.com/aio-libs/aiohttp/pull/2656>`_)
- Do percent encoding for `.url_for()` parameters (`2668 <https://github.com/aio-libs/aiohttp/pull/2668>`_)
- Correctly process request start time and multiple request/response
headers in access log extra (`2641 <https://github.com/aio-libs/aiohttp/pull/2641>`_)
Improved Documentation
----------------------
- Improve tutorial docs, using `literalinclude` to link to the actual files.
(`2396 <https://github.com/aio-libs/aiohttp/pull/2396>`_)
- Small improvement docs: better example for file uploads. (`2401 <https://github.com/aio-libs/aiohttp/pull/2401>`_)
- Rename `from_env` to `trust_env` in client reference. (`2451 <https://github.com/aio-libs/aiohttp/pull/2451>`_)
- Fixed mistype in `Proxy Support` section where `trust_env` parameter was
used in `session.get("http://python.org", trust_env=True)` method instead of
aiohttp.ClientSession constructor as follows:
`aiohttp.ClientSession(trust_env=True)`. (`2688 <https://github.com/aio-libs/aiohttp/pull/2688>`_)
- Fix issue with unittest example not compiling in testing docs. (`2717 <https://github.com/aio-libs/aiohttp/pull/2717>`_)
Deprecations and Removals
-------------------------
- Simplify HTTP pipelining implementation (`2109 <https://github.com/aio-libs/aiohttp/pull/2109>`_)
- Drop `StreamReaderPayload` and `DataQueuePayload`. (`2257 <https://github.com/aio-libs/aiohttp/pull/2257>`_)
- Drop `md5` and `sha1` finger-prints (`2267 <https://github.com/aio-libs/aiohttp/pull/2267>`_)
- Drop WSMessage.tp (`2321 <https://github.com/aio-libs/aiohttp/pull/2321>`_)
- Drop Python 3.4 and Python 3.5.0, 3.5.1, 3.5.2. Minimal supported Python
versions are 3.5.3 and 3.6.0. `yield from` is gone, use `async/await` syntax.
(`2343 <https://github.com/aio-libs/aiohttp/pull/2343>`_)
- Drop `aiohttp.Timeout` and use `async_timeout.timeout` instead. (`2348 <https://github.com/aio-libs/aiohttp/pull/2348>`_)
- Drop `resolve` param from TCPConnector. (`2377 <https://github.com/aio-libs/aiohttp/pull/2377>`_)
- Add DeprecationWarning for returning HTTPException (`2415 <https://github.com/aio-libs/aiohttp/pull/2415>`_)
- `send_str()`, `send_bytes()`, `send_json()`, `ping()` and `pong()` are
genuine async functions now. (`2475 <https://github.com/aio-libs/aiohttp/pull/2475>`_)
- Drop undocumented `app.on_pre_signal` and `app.on_post_signal`. Signal
handlers should be coroutines, support for regular functions is dropped.
(`2480 <https://github.com/aio-libs/aiohttp/pull/2480>`_)
- `StreamResponse.drain()` is not a part of public API anymore, just use `await
StreamResponse.write()`. `StreamResponse.write` is converted to async
function. (`2483 <https://github.com/aio-libs/aiohttp/pull/2483>`_)
- Drop deprecated `slow_request_timeout` param and `**kwargs`` from
`RequestHandler`. (`2500 <https://github.com/aio-libs/aiohttp/pull/2500>`_)
- Drop deprecated `resource.url()`. (`2501 <https://github.com/aio-libs/aiohttp/pull/2501>`_)
- Remove `%u` and `%l` format specifiers from access log format. (`2506 <https://github.com/aio-libs/aiohttp/pull/2506>`_)
- Drop deprecated `request.GET` property. (`2547 <https://github.com/aio-libs/aiohttp/pull/2547>`_)
- Simplify stream classes: drop `ChunksQueue` and `FlowControlChunksQueue`,
merge `FlowControlStreamReader` functionality into `StreamReader`, drop
`FlowControlStreamReader` name. (`2555 <https://github.com/aio-libs/aiohttp/pull/2555>`_)
- Do not create a new resource on `router.add_get(..., allow_head=True)`
(`2585 <https://github.com/aio-libs/aiohttp/pull/2585>`_)
- Drop access to TCP tuning options from PayloadWriter and Response classes
(`2604 <https://github.com/aio-libs/aiohttp/pull/2604>`_)
- Drop deprecated `encoding` parameter from client API (`2606 <https://github.com/aio-libs/aiohttp/pull/2606>`_)
- Deprecate ``verify_ssl``, ``ssl_context`` and ``fingerprint`` parameters in
client API (`2626 <https://github.com/aio-libs/aiohttp/pull/2626>`_)
- Get rid of the legacy class StreamWriter. (`2651 <https://github.com/aio-libs/aiohttp/pull/2651>`_)
- Forbid non-strings in `resource.url_for()` parameters. (`2668 <https://github.com/aio-libs/aiohttp/pull/2668>`_)
- Deprecate inheritance from ``ClientSession`` and ``web.Application`` and
custom user attributes for ``ClientSession``, ``web.Request`` and
``web.Application`` (`2691 <https://github.com/aio-libs/aiohttp/pull/2691>`_)
- Drop `resp = await aiohttp.request(...)` syntax for sake of `async with
aiohttp.request(...) as resp:`. (`2540 <https://github.com/aio-libs/aiohttp/pull/2540>`_)
- Forbid synchronous context managers for `ClientSession` and test
server/client. (`2362 <https://github.com/aio-libs/aiohttp/pull/2362>`_)
Misc
----
- 2552