解决 [HPM] Error occurred while trying to proxy request

之前vue运行访问接口本来没有问题的，今天突然访问老是出现这个问题，常见情况有以下情况，比如：

1、网络不稳定的原因（我就是这种），气气！！！。

2、代理的接口写错，

3、端口被占用

4、后台服务地址失效，自己再手动访问后台服务是否连通

5、node版本低的原因，下面来说说如何解决版本低这个问题

Node 版本更新，下载指定版本 .msi 文件，安装到历史安装目录，即完成版本更新。这是node的官网，下载 | Node.js 中文网

npm 是随 NodeJS 一起发布的包管理工具，默认采用的并不一定是最新版本，如需升级使用以下命令：

npm -g install npm ( 会更新到最新稳定版 )

或 npm -g install npm@2.9.1 ( @后面是指定版本 )
安装完之后node -v 查看node版本

npm -v 查看npm版本

之后再重新启动即可 npm run dev

有些人代理写错，比如下面，是需要写上http:// 。如果有些缺少了http就可以写上这个

但我不是这种方式这么写的，我是这么写的

具体什么错误原因，自己定位好、、、告辞、、、

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