多部分上传，将额外的元数据附加到文件

Question

由于要上传的文件很大，我正在分段上传到预签名的url。（2GB） 。要做的代码如下

docker commit

但这会将文件上传到存储桶。还要将以下数据附加到文件的开头。

public static Boolean upload(File file, String presignedUrl) {
    try {
        //Creating CloseableHttpClient object
        CloseableHttpClient httpclient = HttpClients.createDefault();

        //Creating the MultipartEntityBuilder
        MultipartEntityBuilder entitybuilder = MultipartEntityBuilder.create();

        //Setting the mode
        entitybuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);


        //Adding a file
        entitybuilder.addBinaryBody(file.getName(), file);

        //Building a single entity using the parts
        HttpEntity mutiPartHttpEntity = entitybuilder.build();

        //Building the RequestBuilder request object
        RequestBuilder reqbuilder = RequestBuilder.put(presignedUrl);

        //Set the entity object to the RequestBuilder
        reqbuilder.setEntity(mutiPartHttpEntity);

        //Building the request
        HttpUriRequest multipartRequest = reqbuilder.build();

        //Executing the request
        HttpResponse httpresponse = httpclient.execute(multipartRequest);
        httpclient.close();
    }catch (Exception e){
        return false;
    }
    return true;
}

它也以

结尾

--VqGPRk3XR7rn9v-Yqa0yWjVmyP^M
Content-Disposition: form-data; name="xxxx.csv"; filename="xxxx.csv"^M
Content-Type: application/octet-stream^M
Content-Transfer-Encoding: binary^M
^M

这是行为。但我也在寻找摆脱这种元数据的方法，因为这会阻碍csv处理。 请建议我在这里做错了什么，可以做些什么来避免这种情况。