I'd also go with Go, just because of the amazing standard library. The ability to reuse part of Google's production code for HTTP / JSON is a huge win in my boo

I'd also go with Go, just because of the amazing standard library. The ability to reuse part of Google's production code for HTTP / JSON is a huge win in my book. Also, Go has been around for long enough that you'll find libraries and tutorials even for rare issues. When I evaluated Rust, I was missing that. Their ecosystem, while highly motivated, isn't mature enough yet for infrastructure level code.