/// <exception cref="System.IO.IOException"/>
/// <exception cref="Javax.Servlet.ServletException"/>
public virtual void DoFilter(ServletRequest req, ServletResponse res, FilterChain
chain)
{
HttpServletResponse httpRes = (HttpServletResponse)res;
httpRes.SetHeader("Cache-Control", "no-cache");
long now = Runtime.CurrentTimeMillis();
httpRes.AddDateHeader("Expires", now);
httpRes.AddDateHeader("Date", now);
httpRes.AddHeader("Pragma", "no-cache");
chain.DoFilter(req, res);
}