Features

• Added a GunicornWebWorker feature for extending the aiohttp server configuration by allowing the 'wsgi' coroutine to return web.AppRunner object.
  (#2988)_

• Switch from http-parser to llhttp
  (#3561)_

• Use Brotli instead of brotlipy
  (#3803)_

• Disable implicit switch-back to pure python mode. The build fails loudly if aiohttp
  cannot be compiled with C Accelerators. Use AIOHTTP_NO_EXTENSIONS=1 to explicitly
  disable C Extensions complication and switch to Pure-Python mode. Note that Pure-Python
  mode is significantly slower than compiled one.
  (#3828)_

• Make access log use local time with timezone
  (#3853)_

• Implemented readuntil in StreamResponse
  (#4054)_

• FileResponse now supports ETag.
  (#4594)_

• Add a request handler type alias aiohttp.typedefs.Handler.
  (#4686)_

• AioHTTPTestCase is more async friendly now.

  For people who use unittest and are used to use :py:exc:~unittest.TestCase
  it will be easier to write new test cases like the sync version of the :py:exc:~unittest.TestCase class,
  without using the decorator @unittest_run_loop, just async def test_*.
  The only difference is that for the people using python3.7 and below a new dependency is needed, it is asynctestcase.
  (#4700)_

• Add validation of HTTP header keys and values to prevent header injection.
  (#4818)_

• Add predicate to AbstractCookieJar.clear.
  Add AbstractCookieJar.clear_domain to clean all domain and subdomains cookies only.
  (#4942)_

• Add keepalive_timeout parameter to web.run_app.
  (#5094)_

• Tracing for client sent headers
  (#5105)_

• Make type hints for http parser stricter
  (#5267)_

• Add final declarations for constants.
  (#5275)_

• Switch to external frozenlist and aiosignal libraries.
  (#5293)_

• Don't send secure cookies by insecure transports.

  By default, the transport is secure if https or wss scheme is used.
  Use CookieJar(treat_as_secure_origin="http://127.0.0.1") to override the default security checker.
  (#5571)_

• Always create a new event loop in aiohttp.web.run_app().
  This adds better compatibility with asyncio.run() or if trying to run multiple apps in sequence.
  (#5572)_

• Add aiohttp.pytest_plugin.AiohttpClient for static typing of pytest plugin.
  (#5585)_

• Added a socket_factory argument to BaseTestServer.
  (#5844)_

• Add compression strategy parameter to enable_compression method.
  (#5909)_

• Added support for Python 3.10 to Github Actions CI/CD workflows and fix the related deprecation warnings -- :user:Hanaasagi.
  (#5927)_

• Switched chardet to charset-normalizer for guessing the HTTP payload body encoding -- :user:Ousret.
  (#5930)_

• Added optional auto_decompress argument for HttpRequestParser
  (#5957)_

• Added support for HTTPS proxies to the extent CPython's
  :py:mod:asyncio supports it -- by :user:bmbouter,
  :user:jborean93 and :user:webknjaz.
  (#5992)_

• Added base_url parameter to the initializer of :class:~aiohttp.ClientSession.
  (#6013)_

• Add Trove classifier and create binary wheels for 3.10. -- :user:hugovk.
  (#6079)_

• Started shipping platform-specific wheels with the musl tag targeting typical Alpine Linux runtimes — :user:asvetlov.
  (#6139)_

• Started shipping platform-specific arm64 wheels for Apple Silicon — :user:asvetlov.
  (#6139)_

Bugfixes

• Modify drain_helper() to handle concurrent await resp.write(...) or ws.send_json(...) calls without race-condition.
  (#2934)
• Started using MultiLoopChildWatcher when it's available under POSIX while setting up the test I/O loop.
  (#3450)_
• Only encode content-disposition filename parameter using percent-encoding.
  Other parameters are encoded to quoted-string or RFC2231 extended parameter
  value.
  (#4012)_
• Fixed HTTP client requests to honor no_proxy environment variables.
  (#4431)_
• Fix supporting WebSockets proxies configured via environment variables.
  (#4648)_
• Change return type on URLDispatcher to UrlMappingMatchInfo to improve type annotations.
  (#4748)_
• Ensure a cleanup context is cleaned up even when an exception occurs during startup.
  (#4799)_
• Added a new exception type for Unix socket client errors which provides a more useful error message.
  (#4984)_
• Remove Transfer-Encoding and Content-Type headers for 204 in StreamResponse
  (#5106)_
• Only depend on typing_extensions for Python <3.8
  (#5107)_
• Add ABNORMAL_CLOSURE and BAD_GATEWAY to WSCloseCode
  (#5192)_
• Fix cookies disappearing from HTTPExceptions.
  (#5233)_
• StaticResource prefixes no longer match URLs with a non-folder prefix. For example routes.static('/foo', '/foo') no longer matches the URL /foobar. Previously, this would attempt to load the file /foo/ar.
  (#5250)_
• Acquire the connection before running traces to prevent race condition.
  (#5259)_
• Add missing slots to ```_RequestContextManagerandWSRequestContextManager``
  (#5329)
• Ensure sending a zero byte file does not throw an exception (round 2)
  (#5380)_
• Set "text/plain" when data is an empty string in client requests.
  (#5392)_
• Stop automatically releasing the ClientResponse object on calls to the ok property for the failed requests.
  (#5403)_
• Include query parameters from params keyword argument in tracing URL.
  (#5432)_
• Fix annotations
  (#5466)_
• Fixed the multipart POST requests processing to always release file
  descriptors for the tempfile.Temporaryfile-created
  _io.BufferedRandom instances of files sent within multipart request
  bodies via HTTP POST requests -- by :user:webknjaz.
  (#5494)_
• Fix 0 being incorrectly treated as an immediate timeout.
  (#5527)_
• Fixes failing tests when an environment variable proxy is set.
  (#5554)
• Replace deprecated app handler design in tests/autobahn/server.py with call to web.run_app; replace deprecated aiohttp.ws_connect calls in tests/autobahn/client.py with aiohttp.ClienSession.ws_connect.
  (#5606)_
• Fixed test for HTTPUnauthorized that access the text argument. This is not used in any part of the code, so it's removed now.
  (#5657)_
• Remove incorrect default from docs
  (#5727)_
• Remove external test dependency to http://httpbin.org
  (#5840)_
• Don't cancel current task when entering a cancelled timer.
  (#5853)_
• Added params keyword argument to ClientSession.ws_connect. -- :user:hoh.
  (#5868)_
• Uses :py:class:~asyncio.ThreadedChildWatcher under POSIX to allow setting up test loop in non-main thread.
  (#5877)_
• Fix the error in handling the return value of getaddrinfo.
  getaddrinfo will return an (int, bytes) tuple, if CPython could not handle the address family.
  It will cause a index out of range error in aiohttp. For example, if user compile CPython with
  --disable-ipv6 option but his system enable the ipv6.
  (#5901)_
• Removed the deprecated loop argument from the asyncio.sleep/gather calls
  (#5905)_
• Return None from request.if_modified_since, request.if_unmodified_since, request.if_range and response.last_modified when corresponding http date headers are invalid.
  (#5925)_
• Fix resetting SIGCHLD signals in Gunicorn aiohttp Worker to fix subprocesses that capture output having an incorrect returncode.
  (#6130)_
• Raise 400: Content-Length can't be present with Transfer-Encoding if both Content-Length and Transfer-Encoding are sent by peer by both C and Python implementations
  (#6182)_

Improved Documentation

• Refactored OpenAPI/Swagger aiohttp addons, added aio-openapi
  (#5326)_
• Fixed docs on request cookies type, so it matches what is actually used in the code (a
  read-only dictionary-like object).
  (#5725)_
• Documented that the HTTP client Authorization header is removed
  on redirects to a different host or protocol.
  (#5850)_

Misc

• (#3927), (#4247), (#4247), (#5389), (#5457), (#5486), (#5494), (#5515), (#5625), (#5635), (#5648), (#5657), (#5890), (#5914), (#5932), (#6002), (#6045), (#6131), (#6156), (#6165), (#6166)_

3.7.4.post0 (2021-03-06)

Misc

• Bumped upper bound of the chardet runtime dependency
  to allow their v4.0 version stream.
  (#5366)_