Python DropzoneJS-progressBar未等待进程结束

我目前正在将一些上传表单构建到我的Python Flask web应用程序中。我使用dropzone.js拥有强大的拖放文件处理程序

所以上传后的文件会被一些Python函数处理，处理时间可能会很长。即使后台进程没有完成，Dropzone.js的进度条也会在几秒钟内从0传递到100

我怎么能有一个真正的进度条

以下是我的JS代码：

Dropzone.options.myDropzone = {
    url: "/upload",
    method:'POST',
    autoProcessQueue: false,
    uploadMultiple: true,
    parallelUploads: 3,
    maxFiles: 3,
    addRemoveLinks: true,
    acceptedFiles: 'application/pdf',
    dictRemoveFile: 'Annuler l\'upload',
    dictDefaultMessage: 'Selectionnez un document ou glissez le',
    dictInvalidFileType: 'Ce type de format n\'est pas pris en compte',
    init: function() {
        let dzClosure = this; // Makes sure that 'this' is understood inside the functions below.

        // for Dropzone to process the queue (instead of default form behavior):
        document.getElementById("submit-all").addEventListener("click", function(e) {
            // Make sure that the form isn't actually being sent.
            e.preventDefault();
            e.stopPropagation();
            dzClosure.processQueue();
        });
        this.on("successmultiple", function(files, response) {
            let topPx = 0;
            for (let i = 0; i <= files.length; i++) {

                if (i > 0) { topPx = 80 * i }

                $("<div style='top: " + topPx + "px;' class='flash' onclick=\"$('.flash').fadeOut()\">Fichier(s) uploadé(s) avec succès : " + files[i]['name'] + "</div>").insertAfter($('.content'));
            }
        });
        this.on("error", function(file, response) {
            $("<div class='flash' onclick='$('.flash').fadeOut()'>Erreur lors de l'upload des fichiers : " + response + "</div>").insertAfter($('.content'));
        });
    }
};

这是python.main中的

worker\u调用，需要花费处理时间

提前谢谢

@bp.route('/upload', methods=['GET', 'POST'])
@login_required
def upload():
    if request.method == 'POST':
        for file in request.files:
            f = request.files[file]
            f.save(os.path.join(current_app.config['UPLOAD_FOLDER'], secure_filename(f.filename)))
            worker_from_python.main({
                'path'  : current_app.config['UPLOAD_FOLDER'],
                'config': current_app.config['CONFIG_FILE']
            })
            os.remove(os.path.join(current_app.config['UPLOAD_FOLDER'] + secure_filename(f.filename)))
        return redirect('/upload')
    return render_template('pdf/upload.html')