public <T> void get(String url, Header header, Query query, Type responseType, Callback<T> callback) {
        execute(url, HttpMethod.GET, new RequestHttpEntity(header, query), responseType, callback);
    }
@Test
    void testGet() throws Exception {
        restTemplate.get(TEST_URL, Header.EMPTY, Query.EMPTY, String.class, mockCallback);
        verify(requestClient).execute(any(), eq("GET"), any(), any(), eq(mockCallback));
    }