Отправить POST на сервер и обойти проверку CORS

<script type="text/javascript">
    function ask(){
        $.ajax({
        cache: false,
        type: "POST",
        url: "/quiz/ask",
        data: {
        },
        beforeSend: function(){
            $(".check").html('<div style="text-align:center;"><img src="/design/images/ajaxloader.gif" /></div>');
        },
        success: function(html){
            $(".check").html(html);
        },
        error: function(){
            $(".check").html('Произошла ошибка, попробуйте обновить страницу.');
        }
        });
    }
    $(document).ready(function () {
        ask();
    });
</script>

@SpringBootApplication
public class PostrequestApplication implements CommandLineRunner {

	private static final Logger logger = LoggerFactory.getLogger(PostrequestApplication.class);
	private static final String USER_AGENT = "Mozilla/5.0";

    static final String COOKIES_HEADER = "Set-Cookie";
    static java.net.CookieManager msCookieManager = new java.net.CookieManager();


    public static void main(String[] args) {
		SpringApplication.run(PostrequestApplication.class, args);
	}

	@Override
	public void run(String... strings) throws Exception {
        logger.info(">>>>>>>>>>>>>>>>>>>>>>>>>>>>> START <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<");

        System.setProperty("sun.net.http.allowRestrictedHeaders", "true");


        HttpsURLConnection get = sendGet("https://baza-otvetov.ru/quiz");
        HttpsURLConnection post = preparePostConnection("https://baza-otvetov.ru/quiz/ask", get);
        sendPost(post);
	}


    private HttpsURLConnection preparePostConnection(String url, HttpsURLConnection get) throws Exception {

        System.out.println("\nGET RESPONSE HEADERS");

        Map<String, List<String>> map = get.getHeaderFields();
        for (Map.Entry<String, List<String>> entry : map.entrySet()) {
            System.out.println("Key : " + entry.getKey() + ", Value : " + entry.getValue());
        }


        System.out.println("POST: "+url);

        URL obj = new URL(url);
        HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();

        con.setRequestMethod("POST");

        //set cookies
        Map<String, List<String>> headerFields = get.getHeaderFields();
        List<String> cookiesHeader = headerFields.get(COOKIES_HEADER);

        if (cookiesHeader != null) {
            for (String cookie : cookiesHeader) {
                msCookieManager.getCookieStore().add(null, HttpCookie.parse(cookie).get(0));
            }
        }

        if (msCookieManager.getCookieStore().getCookies().size() > 0) {
            // While joining the Cookies, use ',' or ';' as needed. Most of the servers are using ';'
            con.setRequestProperty("Cookie", join(msCookieManager.getCookieStore().getCookies(), ";"));
        }

        //add reuqest header
        con.setRequestProperty("content-length", "0");
        con.setRequestProperty("User-Agent", USER_AGENT);
        con.setRequestProperty("Accept-Language", "ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7");
        //con.setRequestProperty("Access-Control-Allow-Origin", "*");
        //con.setRequestProperty("Access-Control-Allow-Credentials", "true");
        con.setRequestProperty("origin", "https://baza-otvetov.ru");
        con.setRequestProperty("referer", "https://baza-otvetov.ru/quiz");

        System.out.println("\nPOST REQUEST HEADERS");
        Map<String, List<String>> map_post = con.getHeaderFields();
        for (Map.Entry<String, List<String>> entry : map_post.entrySet()) {
            System.out.println("Key : " + entry.getKey() + ", Value : " + entry.getValue());
        }


        return con;
    }


    private HttpsURLConnection sendGet(String url) throws Exception {

        System.out.println("GET: "+url);

        URL obj = new URL(url);
        HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();

        // optional default is GET
        con.setRequestMethod("GET");

        //add request header
        con.setRequestProperty("User-Agent", USER_AGENT);

        int responseCode = con.getResponseCode();
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        //print result
        System.out.println(response.toString());

        return con;
	}


    private void sendPost(HttpsURLConnection con) throws Exception {

        // Send post request
        con.setDoOutput(true);

        int responseCode = con.getResponseCode();
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        //print result
        System.out.println("RESPONSE: "+response.toString());

    }


    public static String join(List<HttpCookie> var0, String var1) {
        StringBuffer var2 = new StringBuffer();

        for(Iterator var3 = var0.iterator(); var3.hasNext(); var2.append(var3.next().toString())) {
            if (var2.length() != 0) {
                var2.append(var1);
            }
        }

        return var2.toString();
    }

}