Vert.x Web Java

import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.ext.web.Router;
import java.util.Base64;

public class Pixel {

    private static final Buffer GIF = Buffer.buffer(Base64.getDecoder().decode("R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw=="));

    public static void main(String[] args) {
        Vertx vertx = Vertx.vertx();
        Router router = Router.router(vertx);

        router.get("/pixel.gif").handler(ctx -> ctx.response()
                .putHeader("Content-Type", "image/gif")
                .putHeader("Cache-Control", "no-store")
                .end(GIF));

        vertx.createHttpServer().requestHandler(router).listen(8080);
    }
}