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#lang racket/base
(require web-server/servlet
web-server/page)
(provide (all-defined-out))
(define interface-version 'v1)
(define timeout +inf.0)
(define (request-number which-number)
(let/ec esc
(page
(response/xexpr
`(html (head (title "Enter a Number to Add"))
(body ([bgcolor "white"])
(form ([action ,(embed/url
(lambda/page ()
(esc
(string->number
(get-binding 'number)))))]
[method "post"])
"Enter the " ,which-number " number to add: "
(input ([type "text"] [name "number"] [value ""]))
(input ([type "submit"] [name "enter"] [value "Enter"])))))))))
(define/page (start)
(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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