golang使用http下载文件

package main

import (
    "io"
    "net/http"
    "os"
)

var (
    url = "http://127.0.0.1:1789/src/qq.exe"
)

func main() {
    res, err := http.Get(url)
    if err != nil {
        panic(err)
    }
    f, err := os.Create("qq.exe")
    if err != nil {
        panic(err)
    }
    io.Copy(f, res.Body)
}