// create an HttpRequest instance
HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://httpbin.io/user-agent"))
    // set custom user agent header
    .header("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36") // set the User-Agent header
    .build(); // build request