import com.sun.net.httpserver.HttpServer;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.Executors;

public class JdkServer {
    public static void main(String[] args) throws IOException {
        HttpServer server = HttpServer.create(new InetSocketAddress(8081), 0);
        server.createContext("/", exchange -> {
            byte[] body = "<!doctype html><p>Hello from com.sun.net.httpserver</p>\n".getBytes(StandardCharsets.UTF_8);
            exchange.getResponseHeaders().set("Content-Type", "text/html; charset=utf-8");
            exchange.sendResponseHeaders(200, body.length);
            try (var out = exchange.getResponseBody()) {
                out.write(body);
            }
        });
        server.setExecutor(Executors.newVirtualThreadPerTaskExecutor());
        server.start();
        System.out.println("Listening on http://localhost:8081/");
    }
}