In this chapter, we covered the basics of how requests and responses are handled in Yii2. We first explored how Yii2 handles the routing of URL routes, and we learned how to manipulate and create our own custom URL rules. We then explored the yii\web\Request and yii\web\Response objects and gained a better understanding of how we can use these objects to manipulate the requests and responses coming to and from our application. Finally, we learned how events work in Yii2, and we also learned how to create our own events.
In the next chapter, we'll take the knowledge we've gained in this chapter to the next level by exploring how to implement RESTful APIs.