public String queryParam(String queryParamName) {
        return optionalQueryParam(queryParamName).orElse(null);
    }
@Test
    void testRequestUrlQueryParam() {
        RequestUrl requestUrl = new MatchUrl("/api/jobs/enqueued?present=2").toRequestUrl("/api/jobs/:state");
        assertThat(requestUrl.queryParam("present")).isEqualTo("2");
    }