GeeTestTask: solving GeeTest ​

package org.example.capsolver;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

public class Geetest {
    public static String API_KEY = "YOUR_API_KEY";
    public static String SITE_URL = "https://mywebsite.com/geetest/test.php";
    public static String GT = "";         // v3 is required
    public static String Challenge = "";  // v3 is required
    public static String CaptchaId = "";  // v4 is required

    public static void capsolver() throws IOException, InterruptedException {
        JSONObject param = new JSONObject();
        Map<String, Object> task = new HashMap<>();
        task.put("type", "GeeTestTaskProxyLess");
        task.put("websiteURL", SITE_URL);
        task.put("gt", GT);
        task.put("challenge", Challenge);
        task.put("captchaId", CaptchaId);
        param.put("clientKey", API_KEY);
        param.put("task", task);
        String taskId = createTask(param);

        if (Objects.equals(taskId, "")) {
            System.out.println("Failed to create task");
            return;
        }
        System.out.println("Got taskId: "+taskId+" / Getting result...");
        while (true){
            Thread.sleep(1000);
            String token = getTaskResult(taskId);
            if (Objects.equals(token, null)) {
                continue;
            }
            System.out.println(token);
            break;
        }
    }

    public static String requestPost(String url, JSONObject param) throws IOException {
        URL ipapi = new URL(url);
        HttpURLConnection c = (HttpURLConnection) ipapi.openConnection();
        c.setRequestMethod("POST");
        c.setDoOutput(true);

        OutputStream os = null;
        os = c.getOutputStream();
        os.write(param.toString().getBytes("UTF-8"));

        c.connect();
        BufferedReader reader = new BufferedReader(
             new InputStreamReader(c.getInputStream())
        );
        String line;
        StringBuilder sb = new StringBuilder();
        while ((line = reader.readLine()) != null)
        { sb.append(line); }

        return sb.toString();
    }

    public static String createTask(JSONObject param) throws IOException {
        String parsedJsonStr = requestPost("https://api.capsolver.com/createTask", param);
        JSONObject responseJson = new JSONObject(parsedJsonStr);
        return responseJson.get("taskId").toString();
    }

    public static String getTaskResult(String taskId) throws IOException {
        JSONObject param = new JSONObject();
        param.put("clientKey", API_KEY);
        param.put("taskId", taskId);
        String parsedJsonStr = requestPost("https://api.capsolver.com/getTaskResult", param);
        JSONObject responseJson = new JSONObject(parsedJsonStr);

        String status = responseJson.getString("status");
        if (status.equals("ready")) {
            JSONObject solution = responseJson.getJSONObject("solution");
            return solution.toString(4);
        }
        if (status.equals("failed") || responseJson.getInt("errorId")!=0) {
            System.out.println("Solve failed! response: "+parsedJsonStr);
            return "error";
        }
        return null;
    }
}