Features

• Make configuration options in AppRunner also available in run_app() -- by :user:Cycloctane.

  Related issues and pull requests on GitHub: #11633.

Bug fixes

• Switched to backports.zstd for Python <3.14 and fixed zstd decompression for chunked zstd streams -- by :user:ZhaoMJ.

  Note: Users who installed zstandard for support on Python <3.14 will now need to install backports.zstd instead (installing aiohttp[speedups] will do this automatically).

  Related issues and pull requests on GitHub: #11623.

• Updated Content-Type header parsing to return application/octet-stream when header contains invalid syntax. See :rfc:9110#section-8.3-5.

  -- by :user:sgaist.

  Related issues and pull requests on GitHub: #10889.

• Fixed Python 3.14 support when built without support -- by :user:.