Why does the data from the API stop loading after deploying the site?

Question

React

There is a small developed application written in React, I collected it through webpack, after assembly, I deployed the application to firebase hosting.
The transition to the link is carried out, the layout is visible, and so on, but the data that was loaded from the API simply does not appear.
There is an eternal Loading ...
Tell me what could be the problem, it's just not the first time I encounter such a moment during deploy, when the data from the API is simply not loaded.

Answer 1

Open the console in your browser and take a look. So - just guessing