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 https://github.com/Pylons/waitress/issues/359 and
  https://github.com/Pylons/waitress/pull/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.

  See https://github.com/Pylons/waitress/pull/361

- Fixed an issue whereby ``BytesIO`` objects were not properly closed, and
  thereby would not get cleaned up until garbage collection would get around to
  it.

  This led to potential for random memory spikes/memory issues, see
  https://github.com/Pylons/waitress/pull/358 and
  https://github.com/Pylons/waitress/issues/357 .

  With thanks to Florian Schulze for testing/vaidating this fix!

Features
~~~~~~~~

- When the WSGI app starts sending data to the output buffer, we now attempt to
  send data directly to the socket. This avoids needing to wake up the main
  thread to start sending data. Allowing faster transmission of the first byte.
  See https://github.com/Pylons/waitress/pull/364

  With thanks to Michael Merickel for being a great rubber ducky!

- Add REQUEST_URI to the WSGI environment.

  REQUEST_URI is similar to ``request_uri`` in nginx. It is a string that
  contains the request path before separating the query string and
  decoding ``%``-escaped characters.