How to use Laravel to go to upstream IP after a middle page is loaded?

I use my server as a Nginx Reverse proxy, and the task is simple, hit go to website button and then get to the server IP where the real website is.

How to follow the upstream IP and redirect there after a user hits go to website? Any suggestions?

Expected output:

User -> domain (example.com) -> reverse proxy server show page with button continue to website -> hits button -> goes to website which is on another server but with same domain

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