How to allow authorization between two IIS?

Question

IIS

I have IIS that has Kerberos authentication enabled to further process incoming RESP API requests. When users make API requests from browsers, everything works fine. The user login is forwarded from the OS to our IIS and further to the API.
There was a need to make requests to the API with help. cURL from another API located on the same IIS. And such requests are safely wrapped with a 401.2 error.
Tell me, is it possible to set up some forwarding from Site to Site on this IIS? Or maybe you can disable authorization on our Site if the request comes from a specific IP or domain?
Basically, a solution is needed.

Answer 1

If vystradonno then do not use Kerberos
You have enough data to transfer to the server.
And use them.
There are solutions https://identityserver.io/