Redirect from auth to another url app development

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Hi everyone, 

I have two different project, one for backend and one for frontend. I have develop the `auth` endpoint in the backend, apparently this has to be the only way of accessing your app, so no matter if is a new install or just a simple access, this should be your endpoint to enter the app. So what I am trying to achieve is that if the client already exists I want to redirect it to the frontend index. But shopify is rejecting this redirection. 

How can I achieve that?


Thank you very much,