package main

import (
    "bufio"
    "fmt"
    "golang.org/x/net/html/charset"
    "golang.org/x/text/transform"
    "io"
    "io/ioutil"
    "net/http"
)

func DetermineEncoding(r io.Reader) []byte {
    OldReader := bufio.NewReader(r)
    bytes, err := OldReader.Peek(1024)
    if err != nil {
        panic(err)
    }
    e, _, _ := charset.DetermineEncoding(bytes, "")
    reader := transform.NewReader(OldReader, e.NewDecoder())
    all, err := ioutil.ReadAll(reader)
    if err != nil {
        panic(err)
    }
    return all
}

func main() {
    resp, err := http.Get(`http://www.chinanews.com`)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()
    fmt.Printf(`%s`, DetermineEncoding(resp.Body))
}