title: proxy.config.json is not working in Angular 4/5 when i use ng build
body: <p>i am using proxy api setting for API calls in angular 5 as discussed in this website .<a href="https://juristr.com/blog/2016/11/configure-proxy-api-angular-cli/" rel="noreferrer">https://juristr.com/blog/2016/11/configure-proxy-api-angular-cli/</a><a href="https://juristr.com/blog/2016/11/configure-proxy-api-angular-cli/" rel="noreferrer"></a>
  this working properly when i use npm start. but when i build this and host it on IIS. it is not working. i believe proxy.config.json is not added inside dist folder.</p>