v3.9.4: 3.9.4

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Bug fixes

• The asynchronous internals now set the underlying causes
  when assigning exceptions to the future objects
  -- by :user:webknjaz.

  Related issues and pull requests on GitHub:
  #​8089.

• Treated values of Accept-Encoding header as case-insensitive when checking
  for gzip files -- by :user:steverep.

  Related issues and pull requests on GitHub:
  #​8104.

• Improved the DNS resolution performance on cache hit -- by :user:bdraco.

  This is achieved by avoiding an :mod:asyncio task creation in this case.

  Related issues and pull requests on GitHub:
  #​8163.

• Changed the type annotations to allow dict on :meth:aiohttp.MultipartWriter.append,
  :meth:aiohttp.MultipartWriter.append_json and
  :meth:aiohttp.MultipartWriter.append_form -- by :user:cakemanny

  Related issues and pull requests on GitHub:
  #​7741.

• Ensure websocket transport is closed when client does not close it
  -- by :user:bdraco.

  The transport could remain open if the client did not close it. This
  change ensures the transport is closed when the client does not close
  it.

  Related issues and pull requests on GitHub:
  #​8200.

• Leave websocket transport open if receive times out or is cancelled
  -- by :user:bdraco.

  This restores the behavior prior to the change in #​7978.

  Related issues and pull requests on GitHub:
  #​8251.

• Fixed content not being read when an upgrade request was not supported with the pure Python implementation.
  -- by :user:bdraco.

  Related issues and pull requests on GitHub:
  #​8252.

• Fixed a race condition with incoming connections during server shutdown -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  #​8271.

• Fixed multipart/form-data compliance with :rfc:7578 -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  #​8280.

• Fixed blocking I/O in the event loop while processing files in a POST request
  -- by :user:bdraco.

  Related issues and pull requests on GitHub:
  #​8283.

• Escaped filenames in static view -- by :user:bdraco.

  Related issues and pull requests on GitHub:
  #​8317.

• Fixed the pure python parser to mark a connection as closing when a
  response has no length -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  #​8320.

Features

• Upgraded llhttp to 9.2.1, and started rejecting obsolete line folding
  in Python parser to match -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  #​8146, #​8292.

Deprecations (removal in next major release)

• Deprecated content_transfer_encoding parameter in :py:meth:FormData.add_field() <aiohttp.FormData.add_field> -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  #​8280.

Improved documentation

• Added a note about canceling tasks to avoid delaying server shutdown -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  #​8267.

Contributor-facing changes

• The pull request template is now asking the contributors to
  answer a question about the long-term maintenance challenges
  they envision as a result of merging their patches
  -- by :user:webknjaz.

  Related issues and pull requests on GitHub:
  #​8099.

• Updated CI and documentation to use NPM clean install and upgrade
  node to version 18 -- by :user:steverep.

  Related issues and pull requests on GitHub:
  #​8116.

• A pytest fixture hello_txt was introduced to aid
  static file serving tests in
  :file:test_web_sendfile_functional.py. It dynamically
  provisions hello.txt file variants shared across the
  tests in the module.

  -- by :user:steverep

  Related issues and pull requests on GitHub:
  #​8136.

Packaging updates and notes for downstreams

• Added an internal pytest marker for tests which should be skipped
  by packagers (use -m 'not internal' to disable them) -- by :user:Dreamsorcerer.

  Related issues and pull requests on GitHub:
  #​8299.