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
https://stackoverflow.com/questions/37172928/angular-cli-server-how-to-proxy-api-requests-to-another-server
转载于:https://www.cnblogs.com/Lulus/p/9261706.html
