public class HttpUtil extends HttpNetClient { @Override protected void beforeRequest(HttpUriRequest request) { request.addHeader("Custom-Header", "value"); } @Override protected void afterResponse(CloseableHttpResponse response) { System.out.println("HTTP response status: " + response.getStatusLine()); } } HttpUtil httpUtil = new HttpUtil(); httpUtil.setRequestConfig(RequestConfig.custom() .build()); HttpUtil httpUtil = new HttpUtil(); HttpHost proxy = new HttpHost("proxy.example.com", 8080, "http"); httpUtil.setRoutePlanner(new DefaultProxyRoutePlanner(proxy)); HttpUtil httpUtil = new HttpUtil(); httpUtil.setSSLContext(SSLContexts.createDefault());