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TLS configuration.
Args:
client_cert (tuple of str): Path to client cert, path to client key.
ca_cert (str): Path to CA cert file.
verify (bool or str): This can be ``False`` or a path to a CA cert
file.
ssl_version (int): A valid `SSL version`_.
assert_hostname (bool): Verify the hostname of the server.
.. _`SSL version`:
https://docs.python.org/3.5/library/ssl.html#ssl.PROTOCOL_TLSv1
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