How do I configure Rails to use a Proxy URL

Let's say we have a Rails project operating on the domain https://hello.world.com. The way the organization's infrastructure is set up, https://hello.world.com gets proxied into a new URL called - https://my.companies.server.com/hello . When I start the server with Rails s -e production and navigate my browser to https://my.companies.server.com/hello, all the CSS, assets, JS is broken. After some research I changed this config:
config.action_controller.asset_host = 'http://hello.world.com' and the CSS, JS, and assets seem to be working again. Great. One thing that's certainly not right is the links / main navigation (routes). For example, when navigating to any page in the browser, for example, https://my.companies.server.com/about, I get a 404. Seems like there should be a "pass-through" when a request comes in it gets mapped it to https://hello.world/about? Does this make sense? I could use some assistance. What's the best approach here?

My Setup
Rails 6.x.x
Ruby 2.7.x
Nginx

Thanks!