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guile/examples/web/hello.scm
Andy Wingo 0acc595b94 (web http): keys are always symbols
* module/web/http.scm (parse-media-type): Parse media types as symbols.
  (parse-key-value-list, parse-param-component, parse-param-list):
  Change kons to val-parser. Always parse keys as symbols, and always
  either cons, if there is a val, or just have the key, if there is no
  val.  Easier to explain and just as correct.
  (declare-param-list-header!, declare-key-value-list-header!): Adapt to
  key-list and param-list kons change.
  ("Cache-Control", "Pragma", "Transfer-Encoding", "Accept", "Expect")
  ("TE"): Likewise, adapt.
  ("Content-Type"): Param keys are symbols.
2011-01-08 20:50:46 -08:00

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Scheme

;;; Commentary:
;;; A simple web server that responds to all requests with the eponymous
;;; string. Visit http://localhost:8080 to test.
;;; Code:
(use-modules (web server))
;; A handler receives two values as arguments: the request object, and
;; the request body. It returns two values also: the response object,
;; and the response body.
;;
;; In this simple example we don't actually access the request object,
;; but if we wanted to, we would use the procedures from the `(web
;; request)' module. If there is no body given in the request, the body
;; argument will be false.
;;
;; To create a response object, use the `build-response' procedure from
;; `(web response)'. Here we take advantage of a shortcut, in which we
;; return an alist of headers for the response instead of returning a
;; proper response object. In this case, a response object will be made
;; for us with a 200 OK status.
;;
(define (handler request body)
(values '((content-type . (text/plain)))
"Hello, World!"))
(run-server handler)