好奇怪，本网站从早晨开始就一直访问错误，报错信息如下：

502 Bad Gateway
The proxy server received an invalid response from an upstream server. Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://sirit.com.cn/
Server: ews.nginx05.cloud.cm10
Date: 2021/10/19 12:03:33

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搜索了一番，好像是服务器的问题，买的是阿里云的弹性WEB空间，登录到控制台，检查了一番，没发现任何问题。

最后在网站管理页面，把网址停止了之后，又重新启动。

一切又OK了，赶紧把网站备份到本地。