鑑於我之前的嘗試導致了 301 Moved Pe，如何在 Go 中發送 Content-Type: multipart/form-data 的 POST 請求，同時包含 []byte 參數和字串參數

我可以使用 Content-Type: multipart/form-data 發文嗎？

問題：

如何傳送內容類型為 multipart/form-data 的 POST 請求，同時包含 []byte 參數和字串參數？之前的嘗試導致了以下錯誤：

[301 301 Moved Permanently]<...html response body...></...html>

提供的Go 代碼：

<code class="go">func NewPost2(url string) ([]byte, error) {
    m := make(map[string]interface{}, 0)
    m["fileName"] ="good"
    m["name"] = Base64ToByte("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")
    b, _ := json.Marshal(m)

    httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(b))
    httpReq.Header.Set("Content-Type", "multipart/form-data;charset=UTF-8")

    client := &http.Client{}
    resp, err := client.Do(httpReq)
    if err != nil {
        return nil, err
    }

    defer resp.Body.Close()

    if resp.StatusCode = 300 {
        b, _ := ioutil.ReadAll(resp.Body)
        return nil, fmt.Errorf("[%d %s]%s", resp.StatusCode, resp.Status, string(b))
    }

    respData, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }

    return respData, nil
}</code>

答案：

提供的程式碼嘗試在請求正文中以JSON 形式發送[]byte 參數，這不是multipart/form-data 提交的合適格式。

要修正此問題，我們可以使用multipart/form-使用以下更新程式碼進行資料編碼：

<code class="go">func NewPostFile(url string, paramTexts map[string]interface{}, paramFile FileItem) ([]byte, error) {
// if paramFiles ==nil {
//  return NewPost(url,paramTexts,header,transport)
// }

// Create a new multipart writer
bodyBuf := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuf)

// Write text parameters to the multipart writer
for k, v := range paramTexts {
    bodyWriter.WriteField(k, v.(string))
}

// Write the file content to the multipart writer
fileWriter, err := bodyWriter.CreateFormFile(paramFile.Key, paramFile.FileName)
if err != nil {
    fmt.Println(err)
    //fmt.Println("Create form file error: ", error)
    return nil, err
}
fileWriter.Write(paramFile.Content)

// Close the multipart writer
bodyWriter.Close()

// Set the Content-Type header to multipart/form-data
contentType := bodyWriter.FormDataContentType()

// Create the POST request with the multipart/form-data body
resp, err := http.Post(url, contentType, bodyBuf)
if err != nil {
    return nil, err
}

// Handle and process the HTTP response
// ... (remainder of code omitted for brevity)</code>

透過使用multipart/form-data 編碼並正確處理檔案參數，我們現在可以使用[]byte 參數和字串參數成功POST。

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