| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package http2; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.servlet.http.PushBuilder; |
| |
| public class SimpleImagePush extends HttpServlet { |
| |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) |
| throws ServletException, IOException { |
| |
| resp.setCharacterEncoding("UTF-8"); |
| resp.setContentType("text/html"); |
| PrintWriter pw = resp.getWriter(); |
| |
| PushBuilder pb = req.newPushBuilder(); |
| if (pb != null) { |
| pb.path("servlets/images/code.gif"); |
| pb.push(); |
| pw.println("<html>"); |
| pw.println("<body>"); |
| pw.println("<p>The following image was provided via a push request.</p>"); |
| pw.println("<img src=\"" + req.getContextPath() + "/servlets/images/code.gif\"/>"); |
| pw.println("</body>"); |
| pw.println("</html>"); |
| pw.flush(); |
| } else { |
| pw.println("<html>"); |
| pw.println("<body>"); |
| pw.println("<p>Server push requests are not supported by this protocol.</p>"); |
| pw.println("</body>"); |
| pw.println("</html>"); |
| } |
| } |
| } |
