Manejo de errores con Yii2 para API y respuestas JSON

web.php

<?php 
'components'=>[
      'response' => [
            'format' => \yii\web\Response::FORMAT_JSON,
            'on beforeSend' => function ($event) {
                $response = $event->sender;
                $response = $event->sender;
                if ($response->data !== null) {
                    $data = ['success' => $response->isSuccessful];
                    $rawdata = $response->data;
                    if ($response->isSuccessful) {
                        if(array_key_exists('message', $rawdata)){
                            $data['message'] = $rawdata['message'];
                            unset($rawdata['message']);
                        } else {
                            $data['message'] = 'Consulta procesada';
                        }
                        $data['data'] = $rawdata;
                    } else {
                        $data['message'] = $response->data['message'];
                        if (YII_ENV_DEV){
                           $data['report'] = $rawdata; 
                        }
                    }
                    $response->data = $data;
                }
            },
        ],
  ]