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a'OAuth 2.0 Utilities.

This module provides implementations for various OAuth 2.0 utilities.
This includes `OAuth error handling`_ and
`Client authentication for OAuth flows`_.

OAuth error handling
--------------------
This will define interfaces for handling OAuth related error responses as
stated in `RFC 6749 section 5.2`_.
This will include a common function to convert these HTTP error responses to a
:class:`google.auth.exceptions.OAuthError` exception.


Client authentication for OAuth flows
-------------------------------------
We introduce an interface for defining client authentication credentials based
on `RFC 6749 section 2.3.1`_. This will expose the following
capabilities:

    * Ability to support basic authentication via request header.
    * Ability to support bearer token authentication via request header.
    * Ability to support client ID / secret authentication via request body.

.. _RFC 6749 section 2.3.1: https://tools.ietf.org/html/rfc6749#section-2.3.1
.. _RFC 6749 section 5.2: https://tools.ietf.org/html/rfc6749#section-5.2
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