go http协议和文件操作

package main

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

func main() {

    Client := &http.Client{}
    url := "http://www.baidu.com"
    req, err := http.NewRequest("GET", url, nil)
    if err != nil {
        panic("failure to get info from baidu")
    }
    response, err := Client.Do(req)
    if err != nil {
        panic("fail")
    }
    str := make([]byte, 2048)
    size, err := response.Body.Read(str)
    if size == 0 {
        panic(err)
    }
    fmt.Printf("%v", string(str))
    defer response.Body.Close()

    file, err := os.OpenFile("my.txt", os.O_RDWR, 0666)
    if err != nil {
        println("error occuer")
        panic(err)
    } else {
        println("write data ok")
        file.Write(str)
    }
    defer file.Close()
}