protected void executeChain(ServletRequest request, ServletResponse response, FilterChain chain) throws Exception {
        chain.doFilter(request, response);
    }
Actually executes the specified filter chain by calling <code>chain.doFilter(request,response);</code>.
<p/>
Can be overridden by subclasses for custom logic.

@param request  the incoming ServletRequest
@param response the outgoing ServletResponse
@param chain    the filter chain to execute
@throws Exception if there is any error executing the chain.
web/src/main/java/org/apache/shiro/web/servlet/AdviceFilter.java