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 java.io.IOException; 021import javax.servlet.Filter; 022import javax.servlet.FilterChain; 023import javax.servlet.FilterConfig; 024import javax.servlet.ServletException; 025import javax.servlet.ServletRequest; 026import javax.servlet.ServletResponse; 027import javax.servlet.http.HttpServletResponse; 028import org.apache.hadoop.hbase.HBaseInterfaceAudience; 029import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; 030import org.apache.yetus.audience.InterfaceAudience; 031 032@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG) 033public class NoCacheFilter implements Filter { 034 @Override 035 public void init(FilterConfig filterConfig) throws ServletException { 036 } 037 038 @Override 039 public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) 040 throws IOException, ServletException { 041 HttpServletResponse httpRes = (HttpServletResponse) res; 042 httpRes.setHeader("Cache-Control", "no-cache"); 043 long now = EnvironmentEdgeManager.currentTime(); 044 httpRes.addDateHeader("Expires", now); 045 httpRes.addDateHeader("Date", now); 046 httpRes.addHeader("Pragma", "no-cache"); 047 chain.doFilter(req, res); 048 } 049 050 @Override 051 public void destroy() { 052 } 053}