How to implement authorization check on server side in Nuxt+Firebase?

Question

JavaScript

I want to host the entire application on Firebase (hosting, functions, firestore). In store (vuex) I store user data. But when the page is reloaded, the store is reset and you have to wait on the client until the data arrives and the pages that require authorization become available.
The goal is for the client to receive a store already filled with user data.
From the Internet they write that on the server (Firebase Functions) you need to take a token from the request header (Auth ...: Bearer), but a simple page reload does not contain this token in the request.
How? Thank you.