I should really get around to writing some docs for this, but you may find this useful:

https://github.com/davidbanham/kewpie_go

I’ve been using it for years across multiple products.

I also built this for a client lately. It lets them interop their Haskell services with kewpie a bit easier without needing to write a native wrapper.

https://github.com/paidright/kewpie-http