Racket Web服务器无法响应获取参数

Question

我试图回应我们从get参数name获得的内容，但它总是响应

  

名：安培; REQ;＆安培;名称;

使用网址

  

http://localhost:8080/?name=stcoder

源代码是

(require web-server/servlet
         web-server/servlet-env
         web-server/http/bindings)

(define (lookup-binding req id)
  (if (exists-binding? id (request-bindings req))
      (extract-binding/single id (request-bindings req))
      #f))


(provide/contract (my-app (request? . -> . response?)))

(define (my-app req)
  (response/xexpr
   '(html (head (title "Wizard!"))
          (body (p "name:" ,(lookup-binding req 'name))))))

(serve/servlet my-app
               #:launch-browser? #f
               #:quit? #f
               #:listen-ip #f
               #:port 8080
               #:servlet-path "/")