001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.http; 019 020import javax.servlet.Filter; 021import javax.servlet.FilterChain; 022import javax.servlet.FilterConfig; 023import javax.servlet.ServletException; 024import javax.servlet.ServletRequest; 025import javax.servlet.ServletResponse; 026import javax.servlet.http.HttpServletResponse; 027import java.io.IOException; 028 029import org.apache.yetus.audience.InterfaceAudience; 030import org.apache.hadoop.hbase.HBaseInterfaceAudience; 031 032@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG) 033public class NoCacheFilter implements Filter { 034 035 @Override 036 public void init(FilterConfig filterConfig) throws ServletException { 037 } 038 039 @Override 040 public void doFilter(ServletRequest req, ServletResponse res, 041 FilterChain chain) 042 throws IOException, ServletException { 043 HttpServletResponse httpRes = (HttpServletResponse) res; 044 httpRes.setHeader("Cache-Control", "no-cache"); 045 long now = System.currentTimeMillis(); 046 httpRes.addDateHeader("Expires", now); 047 httpRes.addDateHeader("Date", now); 048 httpRes.addHeader("Pragma", "no-cache"); 049 chain.doFilter(req, res); 050 } 051 052 @Override 053 public void destroy() { 054 } 055 056}