我有一个在我的应用程序的beforeAction事件上运行的简单代码：
'on beforeAction' => function ($event) {
throw new \yii\web\NotFoundHttpException('The requested page does not exist.');
},
我希望它只显示我的应用程序的404页面,但它会抛出以下错误：
An Error occurred while handling another error: exception 'yii\web\NotFoundHttpException' with message 'The requested page does not exist.' in /home/files/www/ucms/config/frontend/config.PHP:9 Stack trace: 0 [internal function]: {closure}(Object(yii\base\ActionEvent)) 1 /home/files/www/ucms/vendor/yiisoft/yii2/base/Component.PHP(541): call_user_func(Object(Closure),Object(yii\base\ActionEvent)) 2 /home/files/www/ucms/vendor/yiisoft/yii2/base/Module.PHP(607): yii\base\Component->trigger('beforeAction',Object(yii\base\ActionEvent)) 3 /home/files/www/ucms/vendor/yiisoft/yii2/base/Controller.PHP(139): yii\base\Module->beforeAction(Object(yii\web\ErrorAction)) 4 /home/files/www/ucms/vendor/yiisoft/yii2/base/Module.PHP(455): yii\base\Controller->runAction('error',Array) 5 /home/files/www/ucms/vendor/yiisoft/yii2/web/ErrorHandler.PHP(85): yii\base\Module->runAction('site/error') 6 /home/files/www/ucms/vendor/yiisoft/yii2/base/ErrorHandler.PHP(109): yii\web\ErrorHandler->renderException(Object(yii\web\NotFoundHttpException)) 7 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\web\NotFoundHttpException)) 8 {main} PrevIoUs exception: exception 'yii\web\NotFoundHttpException' with message 'The requested page does not exist.' in /home/files/www/ucms/config/frontend/config.PHP:9 Stack trace: 0 [internal function]: {closure}(Object(yii\base\ActionEvent)) 1 /home/files/www/ucms/vendor/yiisoft/yii2/base/Component.PHP(541): call_user_func(Object(Closure),Object(yii\base\ActionEvent)) 3 /home/files/www/ucms/vendor/yiisoft/yii2/base/Controller.PHP(139): yii\base\Module->beforeAction(Object(yii\base\InlineAction)) 4 /home/files/www/ucms/vendor/yiisoft/yii2/base/Module.PHP(455): yii\base\Controller->runAction('',Array) 5 /home/files/www/ucms/vendor/yiisoft/yii2/web/Application.PHP(84): yii\base\Module->runAction('',Array) 6 /home/files/www/ucms/vendor/yiisoft/yii2/base/Application.PHP(375): yii\web\Application->handleRequest(Object(yii\web\Request)) 7 /home/files/www/ucms/web/index.PHP(17): yii\base\Application->run() 8 {main}
85 line上ErrorHandler.PHP文件中的问题：
$result = Yii::$app->runAction($this->errorAction);
当ErrorHandler尝试运行ErrorAction时,NotFoundHttpException再次被触发,而ErrorHandler只显示没有渲染的错误消息.
解：
public function beforeAction($action)
{
if(!$action instanceof \yii\web\ErrorAction) {
throw new \yii\web\NotFoundHttpException('The requested page does not exist.');
}
return parent::beforeAction($action);
}
上一个答案：
在生产服务器上还需要在index.PHP文件中设置正确的环境设置：
defined('YII_DEBUG') or define('YII_DEBUG',false);
defined('YII_ENV') or define('YII_ENV','prod');
