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Clarify AWS + optional auth checking #1963

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Sep 1, 2023
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Clarify AWS + optional auth checking #1963

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6 changes: 6 additions & 0 deletions docs/source-2.0/aws/aws-auth.rst
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Expand Up @@ -6,6 +6,12 @@ AWS Authentication Traits

This document defines AWS authentication schemes.

If a request contains the ``Authorization`` header or a query string parameter
with the name of ``X-Amz-Algorithm`` containing the value ``AWS4-HMAC-SHA256``,
the request will undergo authentication and be rejected if it fails. Otherwise,
if the :ref:`optionalAuth-trait` is applied, the service shall operate on the
unauthenticated request.

.. smithy-trait:: aws.auth#sigv4
.. _aws.auth#sigv4-trait:

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