api.shopify.install.jsx loader and action not triggered

[PeaceOut]

Hey everyone, 

I'm trying to build a post installation process, and I have seen that you can use the file : api.shopify.install.jsx in the routes directory. 

I can validate that this file is called after installation, as I receive a console.log. But I can also see that the loader and action method are not triggered, as I have console.logs inside the 2 methods, and they don't show up in the server console.

Any idea why the loader is not called? 

From what I understand, the file is called by a POST method, so the action method should be triggered at least ... 

Thanks a lot for the help 🙂