Constructs a Flask Response for when a API Route (path+method) is not found. This is usually
        HTTP 404 but with API Gateway this is a HTTP 403 (https://forums.aws.amazon.com/thread.jspa?threadID=2166840)

        :return: a Flask Response

def route_not_found(*args):
        """
        Constructs a Flask Response for when a API Route (path+method) is not found. This is usually
        HTTP 404 but with API Gateway this is a HTTP 403 (https://forums.aws.amazon.com/thread.jspa?threadID=2166840)

        :return: a Flask Response
        """
        response_data = jsonify(ServiceErrorResponses._MISSING_AUTHENTICATION)
        return make_response(response_data, ServiceErrorResponses.HTTP_STATUS_CODE_403)