Verifying solutions in Java

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.HashMap;
import java.util.Map;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Example {

    public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException, InterruptedException {
        var mapper = new ObjectMapper();

        Map<String, String> values = new HashMap<>() {{
            put("secretKey", "sk_xxxxxxxx");
            put("solution", "..."); // Extract the solution from the request body (_botpoison)
        }};

        String body = mapper.writeValueAsString(values);

        HttpClient client = HttpClient.newHttpClient();

        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("https://api.botpoison.com/verify"))
                .header("accept", "application/json")
                .header("content-type", "application/json")
                .POST(HttpRequest.BodyPublishers.ofString(body))
                .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

        HashMap<String, Object> deserialized = mapper.readValue(response.body(), new TypeReference<Map<String, Object>>() {});

        var isOk = (boolean) deserialized.get("ok");

        if (isOk) {
            System.out.println("Not spam: allow request");
        } else {
            System.out.println("Spam: reject request");
        }
    }

}