protected boolean onAccessDenied(ServletRequest request, ServletResponse response, Object mappedValue) throws Exception {
        return onAccessDenied(request, response);
    }
Processes requests where the subject was denied access as determined by the
{@link #isAccessAllowed(javax.servlet.ServletRequest, javax.servlet.ServletResponse, Object) isAccessAllowed}
method, retaining the {@code mappedValue} that was used during configuration.
<p/>
This method immediately delegates to {@link #onAccessDenied(ServletRequest, ServletResponse)} as a
convenience in that most post-denial behavior does not need the mapped config again.

@param request     the incoming <code>ServletRequest</code>
@param response    the outgoing <code>ServletResponse</code>
@param mappedValue the config specified for the filter in the matching request's filter chain.
@return <code>true</code> if the request should continue to be processed; false if the subclass will
handle/render the response directly.
@throws Exception if there is an error processing the request.
@since 1.0
web/src/main/java/org/apache/shiro/web/filter/AccessControlFilter.java