goroutine test on app engine

hello.go

package hello

import (
	"fmt"
	"http"
	"time"
)

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

func goroutine(n int, w http.ResponseWriter, ch chan int) {
	for i := 0; i < 5; i++ {
		fmt.Fprintf(w, "Routine %d: %d\n", n, i)
		time.Sleep(1000) // sleep 1ms
	}
	ch <- 0
}

func handler(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/plain")
	ch := make(chan int)
	for i := 0; i < 3; i++ {
		go goroutine(i, w, ch)
	}

	for i := 0; i < 3; i++ {
		<-ch
	}
	fmt.Fprintf(w, "Done.")
}