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+API reference
+=============
+
+.. currentmodule:: websockets
+
+Features
+--------
+
+Check which implementations support which features and known limitations.
+
+.. toctree::
+   :titlesonly:
+
+   features
+
+
+:mod:`asyncio`
+--------------
+
+This is the default implementation. It's ideal for servers that handle many
+clients concurrently.
+
+.. toctree::
+   :titlesonly:
+
+   asyncio/server
+   asyncio/client
+
+:mod:`threading`
+----------------
+
+This alternative implementation can be a good choice for clients.
+
+.. toctree::
+   :titlesonly:
+
+   sync/server
+   sync/client
+
+`Sans-I/O`_
+-----------
+
+This layer is designed for integrating in third-party libraries, typically
+application servers.
+
+.. _Sans-I/O: https://sans-io.readthedocs.io/
+
+.. toctree::
+   :titlesonly:
+
+   sansio/server
+   sansio/client
+
+Extensions
+----------
+
+The Per-Message Deflate extension is built in. You may also define custom
+extensions.
+
+.. toctree::
+   :titlesonly:
+
+   extensions
+
+Shared
+------
+
+These low-level APIs are shared by all implementations.
+
+.. toctree::
+   :titlesonly:
+
+   datastructures
+   exceptions
+   types
+
+API stability
+-------------
+
+Public APIs documented in this API reference are subject to the
+:ref:`backwards-compatibility policy <backwards-compatibility policy>`.
+
+Anything that isn't listed in the API reference is a private API. There's no
+guarantees of behavior or backwards-compatibility for private APIs.
+
+Convenience imports
+-------------------
+
+For convenience, many public APIs can be imported directly from the
+``websockets`` package.