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#lang racket/base
(require web-server/servlet
web-server/compat/0/coerce)
(provide (all-defined-out))
(define interface-version 'v1)
(define timeout +inf.0)
; request-number : str -> num
(define (request-number which-number)
(send/suspend/dispatch
(lambda (embed/url)
`(html (head (title "Enter a Number to Add"))
(body ([bgcolor "white"])
(form ([action ,(embed/url
(lambda (request)
(string->number
(extract-binding/single
'number
(request-bindings request)))))]
[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)
`(html (head (title "Sum"))
(body ([bgcolor "white"])
(p "The answer is "
,(number->string (+ (request-number "first") (request-number "second")))))))
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