Why does my random number not update?

I am doing the following in Golang (hosted on Appengine)

Whenever I initiate the app by running dev_appserver command and I access the page at localhost:8080, I get a page with a new random number between 1 and 19. But on refreshing the page in the browser, this number does not change. If I kill the server and re-initiate by running dev_appserver, I get a new random number. How do I get the random number to update on page refresh.

Code follows:

package testpage

import ( "fmt" "net/http" "math/rand" "time" "strconv" )

func init() { http.HandleFunc("/", handler) }

func handler(w http.ResponseWriter, r *http.Request) { fmt.Fprint(w, varHtml) } func random(min, max int) int { rand.Seed(time.Now().Unix()) return rand.Intn(max - min) + min }

var myrand = strconv.Itoa(random(1, 19)) var varHtml = `

Random number is ` + myrand