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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 _send(self, **req_kwargs):
 """Send an authenticated request to a Google API. Args: **req_kwargs: Arbitrary keyword arguments to pass to Requests. Return: requests.Response: The raw response. Raises: LoginException: If :py:meth:`login` has not been called. """

        auth_token = self._auth.getAuthToken()
        if auth_token is None:
            raise exception.LoginException('Not logged in')

        req_kwargs.setdefault('headers', {
            'Authorization': 'OAuth ' + auth_token
        })

        return self._session.request(**req_kwargs)