golang gzipをpostで送受信する

送信

func sendPostData() error {
    gz := new(bytes.Buffer)
    w := gzip.NewWriter(gz)
    if _, err := w.Write(j); err != nil {
        return err
    }
    if err := w.Close(); err != nil {
        return err
    }
    body := bytes.NewReader(gz.Bytes())
    req, err := http.NewRequest(http.MethodPost, "http://xxxx.example.com", body)
    if err != nil {
        return err
    }

    req.Header.Set("Content-Encoding", "gzip")
    res, err := http.DefaultClient.Do(req)
    if err != nil {
        return err
    }

    return nil　
}

受信

func getPostData(r *http.Request) error {
    reader, err := gzip.NewReader(r.Body)
    if err != nil {
        return err
    }
    defer r.Close()

    var b []byte
    scanner := bufio.NewScanner(reader)
    for scanner.Scan() {
        b = scanner.Bytes()
    }
    log.Println(string(b))

    return nil
}