pekko/akka-docs/rst/java/http/routing-dsl/directives/security-directives/authenticateBasicAsync.rst

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.. _-authenticateBasicAsync-java-:
authenticateBasicAsync
======================
Wraps the inner route with Http Basic authentication support using a given ``AsyncAuthenticator<T>``.
Description
-----------
This variant of the :ref:`-authenticateBasic-java-` directive returns a ``Future<Optional<T>>`` which allows freeing up the routing
layer of Akka HTTP, freeing it for other requests. It should be used whenever an authentication is expected to take
a longer amount of time (e.g. looking up the user in a database).
In case the returned option is an empty ``Optional`` the request is rejected with a :class:`AuthenticationFailedRejection`,
which by default is mapped to an ``401 Unauthorized`` response.
Standard HTTP-based authentication which uses the ``WWW-Authenticate`` header containing challenge data and
``Authorization`` header for receiving credentials is implemented in subclasses of ``HttpAuthenticator``.
See :ref:`credentials-and-timing-attacks-java` for details about verifying the secret.
.. warning::
Make sure to use basic authentication only over SSL/TLS because credentials are transferred in plaintext.
.. _HTTP Basic Authentication: https://en.wikipedia.org/wiki/Basic_auth
Example
-------
.. includecode:: ../../../../code/docs/http/javadsl/server/directives/SecurityDirectivesExamplesTest.java#authenticateBasicAsync