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Not really Arc related, but here you go in 3 steps:

1 - Paste the following code into a new document and save in servlet example folder (/usr/plt/collects/web-server/default-web-root/servlets/examples/ If document name changes, change the module name on first line.

(module test mzscheme (require (lib "" "web-server")) (provide (all-defined)) (define interface-version 'v1) (define timeout +inf.0)

  (define cc (make-parameter #f))

  (define (input name) `(input ((type "text") (name ,(format "~a" name)))))
  (define (submit) `(input ((type "submit"))))
  (define (form . body) `(form ((action ,(cc))) ,@body))
  (define (a ref . body) `(a ((href ,ref)) ,@body))
  (define-syntax page
    (syntax-rules ()
      [(page x ...) (send/suspend (lambda (k) (cc k) `(html (body ,x ...))))]))
  (define (get name req)
    (extract-binding/single name (request-bindings req)))

  (define (start initial-request)
    (define foo (get 'foo (page (form (input 'foo) (submit)))))
    (page (a (cc) "click here"))
    (page "you said: " foo))

2 - Start the PLT web server sudo /usr/plt/bin/plt-web-server

3 - Open a web browser and navigate to http://localhost/servlets/examples/

An easy way to check for errors is to open it in DrScheme, click "Run" and they would be highlighted in red.