How to repace domain with IP

I need to pass an IP rather than any taken FQDN to my back-end service. For example:
URL in browser is https://test.domain.com or https://test1.domain.com
I redirected port 443 to http://10.100.0.20:2020

Now, I want to change both domain, above, to the10.100.0.20 before they used by back-end service so that the back-end service work by the IP address in it's configuration not domains.

Is it possible?