golang http傳送檔案

    w := multipart.NewWriter(body)    content_type := w.FormDataContentType()    w.WriteField("api_id", Appid)    w.WriteField("api_secret", Key)    w.WriteField("name", r.Name)    w.WriteField("id_number", r.IdCode)    dd, err := base64.StdEncoding.DecodeString(r.Photo)    fmt.Println(len(dd))    fmt.Println(err)    file, err := w.CreateFormFile("selfie_file", "selfie_file")    file.Write(dd)    w.Close()    tr := &http.Transport{        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},    }    client := &http.Client{Transport: tr}    request, _ := http.NewRequest("POST", RemoteUrl, body)    request.Header.Set("Content-Type", content_type)    rep, err := client.Do(request)    if err != nil {        log.Logger.Error(err.Error())    }    defer rep.Body.Close()    bytes, _ := ioutil.ReadAll(rep.Body)```