Here's an asd file for nio-httpd. Just to make things a little easier on the end user...
nio-httpd.asd:
;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
(defsystem :nio-httpd :components ((:file "nio-server") (:file "nio-httpd" :depends-on ("nio-server"))) :depends-on (:nio))
Cheers, Bill.