glang 다양한 http 요청

func HttpGet(url string) ([]byte, error) {
    resp, err := http.Get(url)
    if err != nil {
        // handle error
        return nil, err
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        // handle error
        return nil, err
    }
    return body, err
}

func HttpPostForm(queryUrl string, queryData map[string]string) ([]byte, error) {
    // )
    if len(queryData) == 0 || queryUrl == "" {
        return nil, errors.New("    ")
    }

    url.Parse(queryUrl)
    urlValue := url.Values{}
    for k, v := range queryData {
        var valList = make([]string, 1)
        valList[0] = v
        urlValue[k] = valList
    }
    resp, err := http.PostForm(queryUrl, urlValue)
    if err != nil {
        return nil, err
    }

    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }
    return body, nil
}
func HttpPostJson(queryUrl string, queryData map[string]string) ([]byte, error) {
    if len(queryData) == 0 || queryUrl == "" {
        return nil, errors.New("    ")
    }

    jsonStr, err := json.Marshal(queryData)
    if err != nil {
        return nil, errors.New("json    ")
    }
    // jsonStr := []byte()
    req, err := http.NewRequest("POST", queryUrl, bytes.NewBuffer([]byte(jsonStr)))
    if err != nil {
        return nil, err
    }
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}

    resp, err := client.Do(req)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }
    return body, nil
}