An, who have guessed, golang based URL-Shortening server based on fasthttp. It will respond with an small plaintext answer on / but has a REST API to add configurable shortening URL's. On my Example was that i bought the Domain
randomporn.de (was a joke in one older company) so it will return a little joke on default access and the "shortened" URL's look like the ULR's in things Like "Youtube" with https://randomporn.de/watch?v=dQw4w9WgXcQ.