intelligently schedule each incoming request in web server handler

(this concurrency plan has further developed in the Speakeasy repo, see below)

using this library https://github.com/lunar-transit/lua-promises
or am I loosing sight of actix? I still kinda think this makes sense, whereas actors and threadpools do lower-level things, right?

note: "promise" is the main term for this, but it doesn't mean anything helpful. "futures" are unwriteable, so I don't think those apply.
https://en.wikipedia.org/wiki/Futures_and_promises

I think this best encapsulates the idea, https://en.wiktionary.org/wiki/backburner#Verb