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public function behaviors()
{
   $post = $this->findModel(Yii::$app->request->get('id'));
    return [
        'httpCache' => [
            'class' => 'yii\filters\HttpCache',
            'only' => ['view'],
            'lastModified' => function ($action, $params) use ($post){
                return strtotime($post->updated);
            },
            'etagSeed' => function ($action, $params)  use ($post) {
                return serialize([$post->updated, $post->views, $post->comments, Yii::$app->user->isGuest ? 0 : 1]);
            }
        ],
    ];
}