TestConnection.java

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpHeaders;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;

public class TestConnection {

    private static final HttpClient httpClient = HttpClient.newBuilder()
            .version(HttpClient.Version.HTTP_1_1)
            .connectTimeout(Duration.ofSeconds(10))
            .build();

    public static void main(String[] args) throws IOException, InterruptedException {

        String url = "https://google.com";
        url = args[0];
        HttpRequest request = HttpRequest.newBuilder()
                .GET()
                .uri(URI.create(url))
                .setHeader("User-Agent", "Java 11 HttpClient Bot") // add request header
                .build();

        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
        HttpHeaders headers = response.headers();
        headers.map().forEach((k, v) -> System.out.println(k + ":" + v));
        System.out.println(response.statusCode());
        System.out.println(response.body());

    }

}