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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _default_request_kwargs(self):
 """The default request keyword arguments to be passed to the requests library."""

        defaults = copy.deepcopy(super(Acls, self)._default_request_kwargs)
        defaults.setdefault('headers', {}).update({
            'X-Auth-Token': self._client.auth._token
        })
        return defaults