fail-safe ningle app with woo server

app.lisp

(ql:quickload '(:ningle :clack))

(defvar *app* (make-instance 'ningle:<app>))

(setf (ningle:route *app* "/")
      "Hello :)")

(setf (ningle:route *app* "/error")
      (lambda (params)
        (declare (ignore params))
        (error "Oops!")))

(clack:clackup
 (lack.builder:builder
  (:backtrace
   :result-on-error `(500 (:content-type "text/plain") ("Internal Server Error")))
  *app*)
 :port 3000
 :server :woo
 :use-default-middlewares nil)