I just created a tool named "Delta". It's the first Go code for me. The reason why I created and wrote it in Go is that I just wanted to learn Go by writing some lines of code ;) https://github.com/kentaro/delta What's "Delta"? Delta is an HTTP shadow proxy server that sits between clients and your server(s) to enable "shadow requests". It's actually just a Go port of Kage. You can consult the doc