并发编程最佳实践作业疑问

问题描述：

1、lock := make(chan content) 需要加buffer吗？试了一下不加程序也不会挂掉，加了是不是可以防止channel阻塞？

2、go fetch(name, lock) 协程里面执行http请求，如果http请求超时，会不会导致 c := <-lock 代码处阻塞？

​3、下图代码还有没有其它问题？

相关代码：

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

type content struct {
    name string
    url  string
    body []byte
}

func main() {
    urls := []string{
        "baidu.com",
        "bing.com",
    }

    lock := make(chan content)
    for _, name := range urls {
        go fetch(name, lock)
    }
    c := <-lock
    writeToFile(c.name, c.url, c.body)
}

func fetch(name string, lock chan content) {
    url := fmt.Sprintf("https://%s", name)
    resp, err := http.Get(url)
    if err != nil {
        panic("request failed")
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        panic("Failed to read buffer data")
    }

    content := content{
        name: name,
        url:  url,
        body: body,
    }
    lock <- content
}

func writeToFile(name, url string, body []byte) {
    if err := ioutil.WriteFile("./"+name+".html", body, 0644); err != nil {
        panic("Failed to write to file")
    }
}