Leveraging HTTP caching

Instead of only server-side caching implementation you can use client-side caching via specific HTTP-headers.

In this recipe, we will cover full-page caching on the basis of the Last-Modified and ETag headers.

Getting ready

Create a new yii2-app-basic application using the Composer package manager, as described in the official guide at http://www.yiiframework.com/doc-2.0/guide-start-installation.html.

1. Create and run migration as follows:

   <?php
   use yii\db\Migration;
   
   class m160308_093233_create_example_tables extends Migration
   {
       public function up()
       {
           $this->createTable('{{%article}}', [
               'id' => $this->primaryKey(),
               'created_at' => $this->integer()->unsigned()-
               >notNull(),
               'updated_at' => $this->integer()->unsigned()->notNull(),
               'title' => $this->string()->notNull(),
               'text' => $this->text()->notNull(),
           ]);
       }
   
       public...