/**
     * The failover stub. Handles the application fault
     *
     * @param Exception $e uncaught exception that caused fault
     * @param Trace $trace handled trace that caused an exception, if built.
     * @return void
     */
    protected function handle500(Exception $e, Trace $trace = null)
    {
        $response = $this->webContext->getResponse();
        $response->setStatus(new HttpStatus(HttpStatus::CODE_500));
        $clname = get_class($e);
        $out = <<<EOT
\t<h1>Internal Server Error</h1>
\t{$clname} : {$e->getMessage()}
\t<hr />
\t<h2>Call Stack</h2>
\t<pre>{$e->getTraceAsString()}</pre>
EOT;
        $response->write($out)->finish();
        if (defined('BUGS_EMAIL')) {
            $this->notify500(BUGS_EMAIL, $e);
        }
    }