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Starting & cleaning up
======================
In case of most backends, you should only instantiate a backend once per
application, as a backend typically allocates resources such as thread or
connection pools.
When ending the application, make sure to call ``backend.close()``, which will
free up resources used by the backend (if any). The close process might be
asynchronous, that is it can complete after the ``close()`` method returns.
Note that only resources allocated by the backends are freed. For example,
if you use the ``AkkaHttpBackend()`` the ``close()`` method will terminate the
underlying actor system. However, if you have provided an existing actor system
upon backend creation (``AkkaHttpBackend.usingActorSystem``), the ``close()``
method will be a no-op.
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