Go 转到http服务器头内容类型设置为多部分表单数据，但在客户端获取内容类型：文本纯文本

GO服务器将标题Content-Type设置为Multipart/Form-Data

router.HandleFunc("/certificates", serveFilesHandler).Methods("GET")

func serveFilesHandler(w http.ResponseWriter, r *http.Request) {

    currentDir, err := os.Getwd()
    if err != nil {
        log.Fatal("Can not find the current directory: ", err)
    }
    pathToCertifs := "../certificates"

    // Create a multipart writer for the response
    multipartWriter := multipart.NewWriter(w)

    files := []string{"client.key", "server.key", "rootCA.key"}

    for _, filename := range files {
        filePath := filepath.Join(currentDir, pathToCertifs, filename)

        fmt.Println("see the filePath: ", filePath)

        // Open the file
        file, err := os.Open(filePath)
        if err != nil {}
        defer file.Close()

        // Create a new form file part
        part, err := multipartWriter.CreateFormFile("files", filename)
        if err != nil {}

        // Copy the file content to the part
        _, err = io.Copy(part, file)
        if err != nil {}
    }

    // Set the content type for the response
    w.Header().Set("Content-Type", multipartWriter.FormDataContentType())
    fmt.Println("Content-Type set to:", w.Header().Get("Content-Type"))
    // printout Content-Type set to: multipart/form-data; boundary=7b326

    // Close the multipart writer
    multipartWriter.Close()
}

但在客户方面，

Expected multipart response, but received: text/plain; charset=utf-8

然而，有效载荷在主体中

body, err := ioutil.ReadAll(resp.Body)
    if err != nil {}
Content-Type: text/plain; charset=utf-8
Response Body:
--aee406774ba6a054d52e39a3cdb72f42d32bd30828adbfb1982d278cab56
Content-Disposition: form-data; name="files"; filename="client.key"
Content-Type: application/octet-stream

-----BEGIN PRIVATE KEY-----
MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQDNg4ZaTLC/GdLK
xzFDIyPlYyKs/hUXpPkZAQk+3gnvmBaDuMNq2jd2nQoQohmk1zIuD8oj9se5L+3P

但我不能按部分获取它，因为内容类型不是多部分/表单数据，所以这不起作用

multipartReader := multipart.NewReader(resp.Body, boundaryFromContentType(contentType))

    // Read each part
    for {
        part, err := multipartReader.NextPart()
        if err != nil {
            break
        }
        defer part.Close()
......

我错过了什么，谢谢？

ps:更多的细节要求张贴这个问题，我觉得这是很清楚，所以我添加这一行，它可能会工作后.