报错：Error occurred while trying to proxy request /api/captcha/code from 192.168.43.242:9528 to http://192.168.43.242:8008

报错如下：

[HPM] Error occurred while trying to proxy request /api/user/getInnerLabel from 192.168.43.242:9528 to http://192.168.43.242:8008 (ECONNREFUSED) (
https://nodejs.org/api/errors.html#errors_common_system_errors)
[HPM] Error occurred while trying to proxy request /api/captcha/code from 192.168.43.242:9528 to http://192.168.43.242:8008 (ECONNREFUSED) (https:
//nodejs.org/api/errors.html#errors_common_system_errors)
[HPM] Error occurred while trying to proxy request /api/user/initLogin from 192.168.43.242:9528 to http://192.168.43.242:8008 (ECONNREFUSED) (http
s://nodejs.org/api/errors.html#errors_common_system_errors)

 报错原因：前端代理到后台的时候，没有找到后台。如何发现呢？浏览器访问http://192.168.43.242:8008，报错找不到页面，如下所示：

说明后台无法访问，最后发现是端口错了。

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