我正在玩Golang，我创建了这个小应用程序，使用goroutines进行了多个并发的api调用。

当应用程序运行时，调用完成后，该应用程序将卡住，这是有道理的，因为由于通道未关闭，无法退出 范围c 循环。

我不确定在哪种情况下可以更好地关闭该通道。

package main

import "fmt"
import "net/http"

func main() {
    links := []string{
        "https://github.com/fabpot",
        "https://github.com/andrew",
        "https://github.com/taylorotwell",
        "https://github.com/egoist",
        "https://github.com/HugoGiraudel",
    }

    checkUrls(links)
}

func checkUrls(urls []string) {
    c := make(chan string)

    for _, link := range urls {
        go checkUrl(link, c)
    }

    for msg := range c {
        fmt.Println(msg)
    }

    close(c) //this won't get hit
}

func checkUrl(url string, c chan string) {
    _, err := http.Get(url)

    if err != nil {
        c <- "We could not reach:" + url
    } else {
        c <- "Success reaching the website:" + url
    }
}