[plt-scheme] starting 2 servlets at the same time

I have 2 servlets.
Servlet1
 #:servlet-path    "/servlet1"

Servlet2
 #:servlet-path    "/servlet2"

I need to run them simultaneously.
I mean when i try to access  http://localhost:8000//servlet1 servlet1
should process the request. And vice versa, when i access
http://localhost:8000//servlet2 servlet2 should process the request.
But now i can run either 1 or 2.

Sorry for dummy question. Thanks.

servlet sample below
#lang scheme
   (require web-server/servlet-env)
   (require web-server/servlet)

  (define (start1 request)
   '(html
     (body "Servlet1")))

    (serve/servlet start1
                 #:launch-browser? #t
                 #:quit? #f
                 #:listen-ip #f
                 #:port 8000
                 #:extra-files-paths
                 (list (build-path my-path "htdocs"))
                 #:servlet-path
                 "/servlet1" )