def METHOD_NAME(self):
    query_params = self.request.query_params.copy()
    # ensure that `award_type_codes` is an array and not a string
    if query_params.get("award_type_codes") is not None:
        query_params["award_type_codes"] = query_params["award_type_codes"].strip("[]").split(",")
    return self._validate_params(query_params)