Single file, "rack-esque" fsharp utility around HttpListener.
####Installation
Either manually copy fack.fs to your project or use paket to add a source file reference.
####Usage
#load "fack.fs"
open Fack
open Fack.Host
let app (e: Env) =
async {
return Response (200, Map.empty, Data "HELLO WORLD"B) }
run app "http://*:4567/"