Golang http.NewRequest GET带Header获取远程网页,并解析gzip压缩

最近小研究了一下GO语言，试着自己写了一个GET获取远程网页的例子。代码如下：

func loginPre1() map[string]interface{} {
 
	client := &http.Client{}
 
	reqest, err := http.NewRequest("GET", "http://login.sina.com.cn/sso/prelogin.php?entry=weibo&callback=sinaSSOController.preloginCallBack&su=Z3V5dWV0ZnRiJTQwMTYzLmNvbQ%3D%3D&rsakt=mod&checkpin=1&client=ssologin.js(v1.4.5)&_=", nil)
 
	if err != nil {
		fmt.Println("Fatal error ", err.Error())
		os.Exit(0)
	}
 
	reqest.Header.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
	reqest.Header.Add("Accept-Encoding", "gzip, deflate")
	reqest.Header.Add("Accept-Language", "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3")
	reqest.Header.Add("Connection", "keep-alive")
	reqest.Header.Add("Host", "login.sina.com.cn")
	reqest.Header.Add("Referer", "http://weibo.com/")
	reqest.Header.Add("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0")
	response, err := client.Do(reqest)
	defer response.Body.Close()
 
	if err != nil {
		fmt.Println("Fatal error ", err.Error())
		os.Exit(0)
	}
 
	if response.StatusCode == 200 {
 
		var body string
 
		switch response.Header.Get("Content-Encoding") {
		case "gzip":
			reader, _ := gzip.NewReader(response.Body)
			for {
                            buf := make([]byte, 1024)
                            n, err := reader.Read(buf)
 
                            if err != nil && err != io.EOF {
                                 panic(err)
                            }
 
                            if n == 0 {
                                 break
                            }
                            body += string(buf)
                        }
		default:
			bodyByte, _ := ioutil.ReadAll(response.Body)
			body = string(bodyByte)
		}
 
		r := regexp.MustCompile(`sinaSSOController.preloginCallBack\((.*?)\)`)
		rs := r.FindStringSubmatch(body)
 
		//json decode
		header := make(map[string]interface{})
		err = json.Unmarshal([]byte(rs[1]), &header)
		if err != nil {
			fmt.Println("Fatal error ", err.Error())
			os.Exit(0)
		}
 
		t := fmt.Sprintf("%f", header["servertime"])
 
		header["servertime"] = strings.Trim(t, ".000000")
 
		return header
	}
 
	return nil
}

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