Simple URL connection checker for proxied connections

UrlChecker.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.stream.Collectors;

public class UrlChecker {
    public static void main(String[] args) {
        if (args.length != 3) {
            System.out.println(
                    "Usage: " + UrlChecker.class.getName() + " " +
                            "<url> <proxy> <port>");
            System.exit(1);
        }
        try {
            String url = args[0];
            String proxyHost = args[1];
            int proxyPort = Integer.parseInt(args[2]);

            Proxy proxy = new Proxy(Proxy.Type.HTTP,
                    new InetSocketAddress(proxyHost, proxyPort));

            URLConnection con = new URL(url).openConnection(proxy);
 
            try (BufferedReader br = new BufferedReader(
                    new InputStreamReader(con.getInputStream()))) {
                System.out.println(br.lines()
                        .collect(Collectors.joining(System.lineSeparator())));
            }

        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
}