flask代码服务器

flask部署到服务器部分代码感觉运行不起来，本地测试正常

用flask写了一个简单的问答网站，本地运行正常，部署到服务器后，可以注册，输入两次密码不一样时，flash不起作用（本地的话是能flash一下警告说密码两次不一致）。可以注册，但无法完成登录操作，感觉好像是session的问题？但是找不出具体...

【环境ECS flask+nginx+gunicorn】修改了代码上传后，服务器还是调用的原来的代码

我在本地修改程序代码（不是静态文件），然后上传到服务器，也上传成功了。但是服务器还是调用的我修改之前的程序。就算我把程序文件删除，打开网站一样也在正常显示！请问这个怎么解决？

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