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url:http://blog.csdn.net/oklzh/archive/2009/08/14/4445722.aspx
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// ½«¹ýÆÚÈÕÆÚÉèÖÃΪһ¸ö¹ýȥʱ¼ä  
response.setHeader("Expires", "Sat, 6 May 1995 12:00:00 GMT");  
// ÉèÖÃ HTTP/1.1 no-cache Í·  
response.setHeader("Cache-Control", "no-store,no-cache,must-revalidate");  
// ÉèÖà IE À©Õ¹ HTTP/1.1 no-cache headers£¬ Óû§×Ô¼ºÌí¼Ó  
response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
// ÉèÖñê×¼ HTTP/1.0 no-cache header.  
response.setHeader("Pragma", "no-cache");  
%> 
<%
// ½«¹ýÆÚÈÕÆÚÉèÖÃΪһ¸ö¹ýȥʱ¼ä
response.setHeader("Expires", "Sat, 6 May 1995 12:00:00 GMT");
// ÉèÖÃ HTTP/1.1 no-cache Í·
response.setHeader("Cache-Control", "no-store,no-cache,must-revalidate");
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response.addHeader("Cache-Control", "post-check=0, pre-check=0");
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response.setHeader("Pragma", "no-cache");
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