public static String post(String url, Map<String, Object> params) throws Exception {
        return post(url, JSON.toJSONString(params), CONNECT_TIMEOUT_DEFAULT_IN_MILL, SOCKET_TIMEOUT_DEFAULT_IN_MILL);
    }
@Test
    public void testSimpleCase() throws Exception {
        String url = "https://httpbin.org/post";
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("foo", "bar");

        String rsp = HttpUtils.post(url, params);
        System.out.println(rsp);
        Assert.assertNotNull(rsp);
    }