propMap.put(API_GSA_RESPONSE_HEADER_LIST, list);
        }
        return list;
    }

    String getApiJsonResponseHeaders();

    default List<Pair<String, String>> getApiJsonResponseHeaderList() {
        @SuppressWarnings("unchecked")
        List<Pair<String, String>> list = (List<Pair<String, String>>) propMap.get(API_JSON_RESPONSE_HEADER_LIST);
        if (list == null) {