@classmethod
def verify_logout_request(cls, logout_request, ticket):
    """verifies the single logout request came from the CAS server
        returns True if the logout_request is valid, False otherwise
        """
    try:
        session_index = cls.get_saml_slos(logout_request)
        session_index = session_index[0].text
        if session_index == ticket:
            return True
        else:
            return False
    except (AttributeError, IndexError):
        return False
