golang channel question

gistfile1.go

package main

import (
	"fmt"
	"net/http"
	"sync"
)

type WebResponse struct {
	url      string
	response *http.Response
	err      error
}

var urls = []string{
	"http://google.com",
	"http://yahoo.com",
	"http://msn.com",
}

var wg sync.WaitGroup

func asyncGetUrl(url string, ch chan *WebResponse) {
	defer wg.Done()
	resp, err := http.Get(url)
	resp.Body.Close()
	ch <- &WebResponse{url, resp, err}
}

func main() {

	ch := make(chan *WebResponse, len(urls))

	for _, url := range urls {
		wg.Add(1)
		go asyncGetUrl(url, ch)
	}

	go func() {
		wg.Wait()
		close(ch)
	}()

	for r := range ch {
		fmt.Printf("%s \n", r.url)
		fmt.Printf("%s \n", r.response.Proto)
		fmt.Printf("%s \n\n", r.response.Status)
	}

}