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#lang racket/base
(require web-server/servlet)
(provide (all-defined-out))
(define interface-version 'v1)
(define timeout +inf.0)
; request-number : str -> num
(define (request-number which-number)
(string->number
(extract-binding/single
'number
(request-bindings (send/suspend (build-request-page which-number))))))
; build-request-page : str -> str -> response
(define (build-request-page which-number)
(lambda (k-url)
(response/xexpr
`(html (head (title "Enter a Number to Add"))
(body ([bgcolor "white"])
(form ([action ,k-url] [method "post"])
"Enter the " ,which-number " number to add: "
(input ([type "text"] [name "number"] [value ""]))
(input ([type "submit"] [name "enter"] [value "Enter"]))))))))
(define (start initial-request)
(response/xexpr
`(html (head (title "Sum"))
(body ([bgcolor "white"])
(p "The answer is "
,(number->string (+ (request-number "first") (request-number "second"))))))))
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