(module handler mzscheme

  ;; type handler : bytes bytes (hash-table-of bytes bytes) -> byte-input-port
  ;; handler : method url headers -> result

  ;; make-file-handler : (U path string) -> handler
  (define (make-file-handler local-file)
    (lambda (method url headers)
      (open-input-file local-file)))

  (define (make-local-server-handler port)
    (lambda (method url headers body)
      (do-something)))
  

  )