| /** |
| * 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 org.apache.hadoop.http; |
| |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| |
| public class NoCacheFilter implements Filter { |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| } |
| |
| @Override |
| public void doFilter(ServletRequest req, ServletResponse res, |
| FilterChain chain) |
| throws IOException, ServletException { |
| HttpServletResponse httpRes = (HttpServletResponse) res; |
| httpRes.setHeader("Cache-Control", "no-cache"); |
| long now = System.currentTimeMillis(); |
| httpRes.addDateHeader("Expires", now); |
| httpRes.addDateHeader("Date", now); |
| httpRes.addHeader("Pragma", "no-cache"); |
| chain.doFilter(req, res); |
| } |
| |
| @Override |
| public void destroy() { |
| } |
| |
| } |