protected function exceptionPage(\Exception $e) : string
    {
        $exStr = ExceptionUtil::toString($e);

        $content = <<<HTML

    <h2>Mayday!</h2>
    <div>
    <b>{$e->getMessage()}</b> @ {$e->getFile()}:{$e->getLine()}
    </div>
    <pre>{$exStr}</pre>
HTML;

        return self::page($content);
    }
protected function exceptionPage(\Exception $e) : string
    {
        $exStr = ExceptionUtil::toString($e);

        $content = <<<HTML

    <h2>Mayday!</h2>
    <div>
    <b>{$e->getMessage()}</b> @ {$e->getFile()}:{$e->getLine()}
    </div>
    <pre>{$exStr}</pre>
HTML;

        return self::page($content);
    }
@param \Exception $e

@return string