[Uno Server] [API endpoints] how can I get the server project make the http calls to api?

[DevTKSS]

Seeing all samples are describing http via the regular ui app and the templated weather forecast class does not really making any calls, my problem is to understand how to get that call send from my uno.server project to the api I am calling like in the catApi Sample. So with a GET, a api key load from .env file and a url. Should not be that difficult...

The program.cs of server project does not have the uno hostbuilder i know so far...

Just as sample, I am trying to just get this .js transfered to c#

https://developers.etsy.com/documentation/tutorials/quickstart

Right at the "Test your API key" 😕 so the first step after they created a nide server where I would use the asp.net server from the uno template...