func Upload(url string, filePath string, accessId string, secret string)(resp string , err error) {
    fp, err := os.Open(filePath)
    if err != nil {
        return resp, err
    }
    defer fp.Close()
    body := &bytes.Buffer{}
    writer := multipart.NewWriter(body)
    defer writer.Close()
    part, err := writer.CreateFormFile("file", filepath.Base(fp.Name()))
    if err != nil {
        return resp, err
    }
    io.Copy(part, fp)
    writer.Close()
    httpReq, err := http.NewRequest(http.MethodPost, url, body)
    if err != nil {
        return resp, err
    }

    httpReq.Header.Add("Content-Type", writer.FormDataContentType())

    authInfo := base64.StdEncoding.EncodeToString([]byte(accessId + ":" + secret))
    httpReq.Header.Add("Authorization", fmt.Sprintf("Basic %s", authInfo))
    cli := &http.Client{}
    httpResp, err := cli.Do(httpReq)
    if err != nil {
        return resp, err
    }
    defer httpResp.Body.Close()
    data, err := ioutil.ReadAll(httpResp.Body)
    if err != nil {
        return resp, err
    }
    if httpResp.StatusCode != http.StatusOK {
        return resp, fmt.Errorf("response error, status: %s, body: %s", httpResp.Status, string(data))
    }

    resp = string(data)
    return resp, nil
}




        public string Upload(string url, string filePath, uint accessId, string secretKey)
        {
            var tmp = accessId.ToString() + ":" + secretKey;
            var sign = System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(tmp));
            MultipartFormDataContent form = new MultipartFormDataContent();
            var content = new StreamContent(new FileStream(filePath, FileMode.Open));
            content.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
            {
                Name = "file",
                FileName = Path.GetFileName(filePath)
            };
            form.Add(content);
            using(HttpClient client = new HttpClient())
            {
                client.DefaultRequestHeaders.Add("Authorization","Basic " + sign);
                client.DefaultRequestHeaders.ExpectContinue = true;
                var response = (client.PostAsync(url, form)).Result;
                var result = response.Content.ReadAsStringAsync().Result;
                if (response.StatusCode != HttpStatusCode.OK) {
                    throw new Exception(result);
                }
                return result;
            }
        }


function upload($url, $file, $accessId, $secretkey) {
    $sign = base64_encode($accessId . ":" . $secretKey);
    $headers = array("Content-type: multipart/form-data", "Authorization: Basic " . $sign);
    $cfile = new \\CURLFile($file,'multipart/form-data',basename($file));
    $options = array(
        CURLOPT_HTTPHEADER      => $headers,
        CURLOPT_HEADER          => 0,
        CURLOPT_SSL_VERIFYPEER  => false,
        CURLOPT_SSL_VERIFYHOST  => 0,
        CURLOPT_POST            => 1,
        CURLOPT_URL             => $url,
        CURLOPT_RETURNTRANSFER  => 1,
        CURLOPT_TIMEOUT         => 10000,
        CURLOPT_POSTFIELDS      => array("file" => $cfile)
    );
    $ch = curl_init();
    curl_setopt_array($ch, $options);
    $ret = curl_exec($ch);
    $error = curl_error($ch);
    $info = curl_getinfo($ch);
    curl_close($ch);
    if ($error != "") {
        throw new \\Exception($error);
    }
    $code = $info["http_code"];
    if ($code != 200) {
        throw new \\Exception("status: " . $code . ", message: " . $ret);
    }
    return $ret;

}
```


public JSONObject Upload(String url, String filePath, String accessId, String secret) {
        OkHttpClient client = new OkHttpClient();
        File file  = new File(filePath);
        RequestBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("file", file.getName(),
                        RequestBody.create(MediaType.parse("multipart/form-data"), file))
                .build();

        String authString = accessId+ ":" + secret;
        byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());
        String authStringEnc = new String(authEncBytes);

        Request.Builder builder  = new Request.Builder()
                .url(url)
                .post(requestBody)
                .addHeader("Authorization", "Basic " + authStringEnc);



        Request request = builder.build();
        JSONObject jsonRet = null;
        Response response = null;
        try {
            response = client.newCall(request).execute();
            if(response.code() == 200){
                String retMsg = response.body().string();
                jsonRet = new JSONObject(retMsg);
            }
            else{
                jsonRet = new JSONObject();
                jsonRet.put("retCode", 10101);
                jsonRet.put("errMsg", "CallApiError,HttpStatus Code:" + response.code());
            }
        } catch (IOException e) {
            jsonRet = new JSONObject();
            jsonRet.put("retCode", 10100);
            jsonRet.put("errMsg", e.getMessage());
        }finally {
            if (response != null) {
                response.close();
            }
        }
        return jsonRet;
    }


struct memory {
    char *data;
    size_t size;
    memory(): data(NULL), size(0) {}
    ~memory() {
        if (data) {
            free(data);
        }
    }
};

static size_t callback(void *data, size_t size, size_t nmemb, void *userp)
{
    size_t realsize = size * nmemb;
    struct memory *mem = (struct memory *)userp;

    char *ptr = (char *)realloc(mem->data, mem->size + realsize + 1);
    if(ptr == NULL)
        return 0; 

    mem->data = ptr;
    memcpy(&(mem->data[mem->size]), data, realsize);
    mem->size += realsize;
    mem->data[mem->size] = 0;
    return realsize;
}


std::string upload(const std::string url, const std::string &file, uint32_t accessId, const std::string &secretKey, std::string &err) {
    CURL *pcurl = curl_easy_init();
    if (pcurl == NULL) {
        err.assign("curl_easy_init error");
        return "";
    }
    struct curl_httppost *post = NULL;
    struct curl_httppost *last = NULL;
    std::string base;
    //for unix/linux
    size_t pos = file.find_last_of("/");
    if (pos >= 0) {
        base = file.substr(pos + 1);
    } 
    //for windows
    pos = file.find_last_of("\\\\");
    if (pos >= 0) {
        return base = file.substr(pos + 1);
    }
    curl_formadd(&post, &last, CURLFORM_PTRNAME, "file", CURLFORM_FILE, file.c_str(), CURLFORM_FILENAME, base.c_str(), CURLFORM_END);


    char buf[128];
    char dst[128];
    char authInfo[256];
    snprintf(buf, sizeof(buf), "%u:%s", accessId, secretKey.c_str());
    Base64encode(dst, buf, strlen(buf));
    snprintf(authInfo, sizeof(authInfo), "Authorization: Basic %s", dst);


    curl_slist *plist = NULL;
    plist = curl_slist_append(plist, "Content-Type: multipart/form-data");
    plist = curl_slist_append(plist, authInfo);


    curl_easy_setopt(pcurl, CURLOPT_CONNECTTIMEOUT, 10);
    curl_easy_setopt(pcurl, CURLOPT_TIMEOUT, 10);
    curl_easy_setopt(pcurl, CURLOPT_POST, true); 


    curl_easy_setopt(pcurl, CURLOPT_HTTPHEADER, plist);
    curl_easy_setopt(pcurl, CURLOPT_URL, url.c_str());


    curl_easy_setopt(pcurl, CURLOPT_HTTPPOST, post);
    curl_easy_setopt(pcurl, CURLOPT_WRITEFUNCTION, callback);
    struct memory chunk;
    curl_easy_setopt(pcurl, CURLOPT_WRITEDATA, (void *)&chunk);
    curl_easy_setopt(pcurl, CURLOPT_NOSIGNAL, 1);


    CURLcode res = curl_easy_perform(pcurl); 
    curl_slist_free_all(plist);


    // Check for errors
    if (res != CURLE_OK) 
    {
        char buf[1024];
        snprintf(buf, sizeof(buf), "curl_easy_perform error: %s", curl_easy_strerror(res));
        err.assign(buf);
        curl_easy_cleanup(pcurl);
        return "";
    }
    long status = 0;
    curl_easy_getinfo(pcurl, CURLINFO_RESPONSE_CODE, &status);
    curl_easy_cleanup(pcurl);
    if (status != 200) {
        char buf[1024];
        snprintf(buf, sizeof(buf), "%ld %s", status, chunk.data);
        err.assign(buf);
        return "";
    }


    std::string ret;
    ret.assign(chunk.data);
    return ret;
}
```