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| #lang racket | |
| (require web-server/servlet | |
| web-server/servlet-env | |
| web-server/templates) | |
| (define html-utf-8-mime-type | |
| "text-html; charset=utf-8") | |
| (define html-utf-8-mime-type/bytes | |
| (string->bytes/utf-8 html-utf-8-mime-type)) | |
| (define (respond-html code message headers body) | |
| (response/full code | |
| (string->bytes/utf-8 message) | |
| (current-seconds) | |
| html-utf-8-mime-type/bytes | |
| headers | |
| (list (string->bytes/utf-8 body)))) | |
| (define (not-found req) | |
| (let ([uri (url->string (request-uri req))]) | |
| (respond-html 404 | |
| "Not Found" | |
| empty | |
| (include-template "not-found.html")))) | |
| (define (hi thing query-params) | |
| (include-template "hi.html")) | |
| (define (not-allowed method) | |
| (include-template "not-allowed.html")) | |
| (define (hello req) | |
| (respond-html 200 | |
| "OK" | |
| empty | |
| (hi "espresso" | |
| (url-query (request-uri req))))) | |
| (define (method-not-allowed req) | |
| (respond-html 405 | |
| "Method Not Allowed" | |
| empty | |
| (not-allowed (request-method req)))) | |
| (define-values (dispatcher _) | |
| (dispatch-rules | |
| [("hello") #:method "get" hello] | |
| [("hello") #:method (regexp ".*") method-not-allowed] | |
| [else not-found])) | |
| ;; after loading this file, launch the server by evaluating | |
| ;; (serve/servlet dispatcher #:servlet-regexp #rx"") |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Most well-defined @|thing| in the Europe!</title> | |
| </head> | |
| <body> | |
| <h1>Works!</h1> | |
| <h2>Correct!</h2> | |
| @unless[(empty? query-params)]{ | |
| <h3>Fast!</h3> | |
| |@(include-template "list.html") | |
| } | |
| </body> | |
| </html> |
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| <dl> | |
| @in[q query-params]{ | |
| <dt>@(car q)</dt> | |
| <dd>@(cdr q)</dd> | |
| } | |
| </dl> |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Angry Face</title> | |
| </head> | |
| <body> | |
| <h1>What are you trying to do?</h1> | |
| <p>The @|method| HTTP method is not allowed.</p> | |
| </body> | |
| </html> |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Sad Face</title> | |
| </head> | |
| <body> | |
| <h1>What are you looking for?</h1> | |
| <p>There was nothing found at</p> | |
| <pre>@|uri|</pre> | |
| </body> | |
| </html> |
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A skeletal Racket web server based on conventional URL dispatching. No continuations. There is only one route,
hello, which responds toGETrequests in one way, and to all other HTTP methods in another way. A fallback method handles all other URLs (and methods).