Angular 请求另一服务的api（请求代理）

1.edit "start" of your package.json to look below
定义一个叫做start的新命令

"start": "ng serve --proxy-config proxy.conf.json",
或者
"start": "ng serve --proxy-config proxy.conf.json --port=9000",

如果不加参数port，默认端口4200
2.create a new file called proxy.conf.json in the root of the project and inside of that define your proxies like below
创建一个proxy.conf.json文件，定义所有/api的请求重定向到http://api.yourdomai.com

{
  "/api": {
    "target": "http://api.yourdomai.com",
    "secure": false
  }
}

3.Important thing is that you use npm start instead of ng serve
启动命令使用ng start，而非ng serve

参考资料

angular-cli server - how to proxy API requests to another server?