长时间监听Flas的响应时Dropzone没有响应

Question

我正在用flask dropzone将一个文件上传到flask服务器。 然后用客户端下载的另一个文件响应dropzone。问题是，这段代码只在程序不花太多时间处理上传的文件，只发送一些有点静态的东西时才起作用

简言之，服务器响应的时间越长，客户端响应响应的可能性就越小；无法下载随响应一起发送的文件

我的客户包括dropzone

<p> Drop your csv file including the addresses here </p>
{{ dropzone.create('/upload') }}
<button id="upload">Upload</button>
{{ dropzone.load_js() }}
{{ dropzone.config(custom_init="this.on('success', function(info,response)
    {
    var csvfile = JSON.parse(response)['file'];
    console.log(csvfile);
    console.log('Successfully downloaded file!')
    const blob = new Blob([csvfile], {type:'text/csv'});
    const url = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.setAttribute('hidden','');
    a.setAttribute('href', url);
    a.setAttribute('download', 'predictions.csv');
    document.body.appendChild(a)
    a.click();
    document.body.removeChild(a);})") }}

我处理上传文件的路径

@app.route('/upload', methods=['GET', 'POST'])
@login_required
def upload():
    if current_user.is_subscribed:
        model = load_model()
        if request.method == 'POST':
            for key, file in request.files.items():
                if key.startswith('file'):
                    csvfile = update_csv(model=model, file=list(reader(codecs.iterdecode(file, 'utf-8-sig'), delimiter=";")))
                    #---------- Get updated csv file with predictions
                    response = json.dumps({'file': csvfile})
                    print("Sending response:")
                    return response

        return render_template('upload.html', response=response)
    return redirect(url_for("index"))

有什么解决办法吗