Smallest Java hello world web application

• Requires no dependencies other the Java runtime itself. 
• Since JDK 11+, you can run the file directly

	import java.io.OutputStream;
	import java.net.InetSocketAddress;
	import com.sun.net.httpserver.HttpServer;
	public class WebApp {
	public static void main(String[] args) throws Exception {
	HttpServer server = HttpServer.create(new InetSocketAddress(9394), 0);
	server.createContext("/ping").setHandler(h -> {
	final String response = "pong!";
	h.sendResponseHeaders(200, response.getBytes().length);
	try (OutputStream os = h.getResponseBody()) {
	os.write(response.getBytes());
	}
	});
	server.createContext("/shutdown").setHandler(h -> server.stop(0));
	server.start();
	}
	}

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