- update to 9.1:
**Version 9.1 fixes a security issue introduced in version 8.0.**
* Restored compatibility of ``python -m websockets`` with Python < 3.9.
* Restored compatibility with mypy.
* Fixed issues with the packaging of the 9.0 release.
* :class:`~datastructures.Headers` and
:exc:`~datastructures.MultipleValuesError` were moved from
``websockets.http`` to :mod:`websockets.datastructures`. If you're using
them, you should adjust the import path.
* The ``client``, ``server``, ``protocol``, and ``auth`` modules were
moved from the ``websockets`` package to ``websockets.legacy``
sub-package, as part of an upcoming refactoring. Despite the name,
they're still fully supported. The refactoring should be a transparent
upgrade for most uses when it's available. The legacy implementation
will be preserved according to the `backwards-compatibility policy`_.
* The ``framing``, ``handshake``, ``headers``, ``http``, and ``uri``
modules in the ``websockets`` package are deprecated. These modules
provided low-level APIs for reuse by other WebSocket implementations,
but that never happened. Keeping these APIs public makes it more
difficult to improve websockets for no actual benefit.
* Added compatibility with Python 3.9.
* Added support for IRIs in addition to URIs.
* Added close codes 1012, 1013, and 1014.
* Raised an error when passing a :class:`dict` to