1   /*
    2    * Copyright 2003,2004 The Apache Software Foundation.
    3    * 
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    * 
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    * 
   10    * Unless required by applicable law or agreed to in writing, software
   11    * distributed under the License is distributed on an "AS IS" BASIS,
   12    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   13    * See the License for the specific language governing permissions and
   14    * limitations under the License.
   15    */
   16   
   17   package org.apache.struts.chain.servlet;
   18   
   19   
   20   import javax.servlet.http.HttpServletResponse;
   21   import org.apache.commons.chain.Context;
   22   import org.apache.commons.chain.web.servlet.ServletWebContext;
   23   import org.apache.struts.chain.AbstractRequestNoCache;
   24   
   25   
   26   /**
   27    * <p>Check to see if the controller is configured to prevent caching,
   28    * and if so, set the no cache HTTP response headers.</p>
   29    *
   30    * @version $Rev: 54933 $ $Date: 2004-10-16 18:04:52 +0100 (Sat, 16 Oct 2004) $
   31    */
   32   
   33   public class RequestNoCache extends AbstractRequestNoCache {
   34   
   35   
   36       // ------------------------------------------------------- Protected Methods
   37   
   38   
   39       protected void requestNoCache(Context context) {
   40   
   41           ServletWebContext swcontext = (ServletWebContext) context;
   42           HttpServletResponse response = swcontext.getResponse();
   43           
   44           response.setHeader("Pragma", "No-cache");
   45           response.setHeader("Cache-Control", "no-cache,no-store,max-age=0");
   46           response.setDateHeader("Expires", 1);
   47   
   48       }
   49   
   50   
   51   }