yii\web\ErrorHandler::renderException PHP Method

    protected function renderException($exception)
    {
        if (Yii::$app->has('response')) {
            $response = Yii::$app->getResponse();
            // reset parameters of response to avoid interference with partially created response data
            // in case the error occurred while sending the response.
            $response->isSent = false;
            $response->stream = null;
            $response->data = null;
            $response->content = null;
        } else {
            $response = new Response();
        }
        $useErrorView = $response->format === Response::FORMAT_HTML && (!YII_DEBUG || $exception instanceof UserException);
        if ($useErrorView && $this->errorAction !== null) {
            $result = Yii::$app->runAction($this->errorAction);
            if ($result instanceof Response) {
                $response = $result;
            } else {
                $response->data = $result;
            }
        } elseif ($response->format === Response::FORMAT_HTML) {
            if (YII_ENV_TEST || isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] === 'XMLHttpRequest') {
                // AJAX request
                $response->data = '<pre>' . $this->htmlEncode(static::convertExceptionToString($exception)) . '</pre>';
            } else {
                // if there is an error during error rendering it's useful to
                // display PHP error in debug mode instead of a blank screen
                if (YII_DEBUG) {
                    ini_set('display_errors', 1);
                }
                $file = $useErrorView ? $this->errorView : $this->exceptionView;
                $response->data = $this->renderFile($file, ['exception' => $exception]);
            }
        } elseif ($response->format === Response::FORMAT_RAW) {
            $response->data = static::convertExceptionToString($exception);
        } else {
            $response->data = $this->convertExceptionToArray($exception);
        }
        if ($exception instanceof HttpException) {
            $response->setStatusCode($exception->statusCode);
        } else {
            $response->setStatusCode(500);
        }
        $response->send();
    }

 /**
  * Renders the exception.
  * @param \Exception $exception the exception to be rendered.
  */
 protected function renderException($exception)
 {
     // debug info ----------------------------------------------------------
     \common\helpers\AppDebug::dump(['method' => __METHOD__, 'line' => __LINE__, 'exception' => $this->htmlEncode($this->convertExceptionToString($exception)), 'module' => AppHelper::getModuleName(), 'controller' => AppHelper::getControllerName(), 'action' => AppHelper::getActionName(), 'route' => AppHelper::getRoute(), 'clientIp' => AppHelper::getClientIp()]);
     // ---------------------------------------------------------------------
     parent::renderException($exception);
 }