+1 At apitools.com we use openresty as well. We chose lua (over javascript) because it's super fast, and because it has good sandboxing/ isolation properties which make it safe to handle arbitrary middleware.
Really? Telegram is a trend? In India I doubt many people even heard about it.
I think I will give it a serious thought if it open sources its code base or otherwise it's as good as Viber or Line as an alternative. Same goes with helm.is.