Angular 請求另一服務的api（請求代理）

1.edit "start" of your package.json to look below
定義一個叫做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",

如果不加參數port，默認端口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
創建一個proxy.conf.json文件，定義所有/api的請求重定向到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
啟動命令使用ng start，而非ng serve

參考資料

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