Sourced from waitress's changelog.

2.1.2

Bugfix

- When expose_tracebacks is enabled waitress would fail to properly encode
  unicode thereby causing another error during error handling. See
  https://github.com/Pylons/waitress/pull/378

Header length checking had a calculation that was done incorrectly when the
data was received across multple socket reads. This calculation has been
corrected, and no longer will Waitress send back a 413 Request Entity Too
Large. See Pylons/waitress#376

Security Bugfix

• in 2.1.0 a new feature was introduced that allowed the WSGI thread to start sending data to the socket. However this introduced a race condition whereby a socket may be closed in the sending thread while the main thread is about to call select() therey causing the entire application to be taken down. Waitress will no longer close the socket in the WSGI thread, instead waking up the main thread to cleanup. See Pylons/waitress#377

• 0aa4879 Remove change of default for clear_untrusted_proxy_headers
• 2784628 Revert "Merge pull request #370 from Yourun-proger/del_warnings"
• 479df63 Prep 2.1.2
• 4f6789b Merge pull request #377 from Pylons/bugfix/select-closed-socket-race
• 1952050 Merge pull request #379 from Pylons/enhancement/pyupgrade-3.7
• 8f5b473 pyupgrade 3.7
• c7a3d7e Only close socket in the main thread
• 7c3739b Merge pull request #376 from Pylons/bugfix/header-calculation
• 3066fdd Merge pull request #378 from Pylons/bugfix/expose_tracebacks-encode-error
• 4467d76 Fix tests to assume body is bytes
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Sourced from waitress's changelog.

2.1.1

Security Bugfix

- Waitress now validates that chunked encoding extensions are valid, and don't
  contain invalid characters that are not allowed. They are still skipped/not
  processed, but if they contain invalid data we no longer continue in and
  return a 400 Bad Request. This stops potential HTTP desync/HTTP request
  smuggling. Thanks to Zhang Zeyu for reporting this issue. See
  https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36


Waitress now validates that the chunk length is only valid hex digits when
parsing chunked encoding, and values such as 0x01 and +01 are no
longer supported. This stops potential HTTP desync/HTTP request smuggling.
Thanks to Zhang Zeyu for reporting this issue. See
https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36


Waitress now validates that the Content-Length sent by a remote contains only
digits in accordance with RFC7230 and will return a 400 Bad Request when the
Content-Length header contains invalid data, such as +10 which would
previously get parsed as 10 and accepted. This stops potential HTTP
desync/HTTP request smuggling Thanks to Zhang Zeyu for reporting this issue. See
https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36


2.1.0
Python Version Support

• Python 3.6 is no longer supported by Waitress

• Python 3.10 is fully supported by Waitress

Bugfix

- ``wsgi.file_wrapper`` now sets the ``seekable``, ``seek``, and ``tell``
  attributes from the underlying file if the underlying file is seekable. This
  allows WSGI middleware to implement things like range requests for example
See Pylons/waitress#359 and
Pylons/waitress#363

In Python 3 OSError is no longer subscriptable, this caused failures on
Windows attempting to loop to find an socket that would work for use in the
trigger.

</tr></table>

... (truncated)

• 9e0b8c8 Merge pull request from GHSA-4f7p-27jc-3c36
• b28c9e8 Prep for 2.1.1
• bd22869 Remove extraneous calls to .strip() in Chunked Encoding
• d9bdfa0 Validate chunk size in Chunked Encoding are HEXDIG
• d032a66 Error when receiving back Chunk Extension
• 884bed1 Update tests to remove invalid chunked encoding chunk-size
• 1f6059f Be more strict in parsing Content-Length
• e75b0d9 Add new regular expressions for Chunked Encoding
• 22c0394 Merge pull request #367 from Pylons/fixup/collect-wasyncore-tests
• dc15d9f Make sure to collect all wasyncore tests
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