Release v3.9.4 (#8201)

Preparing for tomorrow, let me know if there's any reason to delay.
@bdraco @webknjaz

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Dreamsorcerer

CHANGES.rst

@@ -10,6 +10,219 @@
 
 .. towncrier release notes start
 
+
+3.9.4 (2024-04-11)
+==================
+
+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:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`8252`.
+
+
+
+- Fixed a race condition with incoming connections during server shutdown -- by :user:`Dreamsorcerer`.
+
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`8271`.
+
+
+
+- Fixed ``multipart/form-data`` compliance with :rfc:`7578` -- by :user:`Dreamsorcerer`.
+
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`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:*
+  :issue:`8283`.
+
+
+
+- Escaped filenames in static view -- by :user:`bdraco`.
+
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`8146`, :issue:`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:*
+  :issue:`8280`.
+
+
+
+
+Improved documentation
+----------------------
+
+- Added a note about canceling tasks to avoid delaying server shutdown -- by :user:`Dreamsorcerer`.
+
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`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:*
+  :issue:`8299`.
+
+
+
+
+----
+
+
 3.9.3 (2024-01-29)
 ==================
 

CHANGES/7741.bugfix.rst

@@ -1,4 +1,4 @@
-__version__ = "3.9.3.dev0"
+__version__ = "3.9.4"
 
 from typing import TYPE_CHECKING, Tuple