We can find the proxy documentation for Angular-CLI over here:
https://github.com/angular/angular-cli/blob/master/docs/documentation/stories/proxy.md
After setting up a file called proxy.conf.json in your root folder, edit your package.json to include the proxy config on ng start. After adding "start": "ng serve --proxy-config proxy.conf.json" to your scripts, run npm start and not ng serve, because that will ignore the flag setup in your package.json.
current version of angular-cli: 1.1.0