@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException
{
HttpServletResponse response=(HttpServletResponse)res;
response.setHeader("Cache-Control", "no-cache, no-store, "
+ "must-revalidate");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", -1);
chain.doFilter(req, res);
}
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