How to properly close a site in Yii2?

Question

Yii

There is a task to make a setting for the application that would close its client part, changing everything to one stub.
How to implement this at the code level (where to read / look at examples)?
Z.Y. The closing process itself at the code level and the redirect to the stub are unclear
Thanks in advance

Answer 1

Use the catchAll application property for this,
you can read more here https://github.com/yiisoft/yii2/blob/master/docs/g...

Answer 2

At the very beginning of the request, you check if the request contains a cookie (or any other admin identifier), if not, then show a stub.
For this purpose, for example, on beforeRequest is suitable