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Starting & cleaning up
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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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