During development, you often end up in the situation where you have your backend API server running at one address (i.e.
localhost:3000) while your frontend development server runs on another (i.e.
localhost:4200). However, in your Angular services that query the backend API, you don’t obviously want to hard-code the developement server’s host, but instead write your calls as follows:
this.http.get('/api/v1/people') .map(res => res.json());
Clearly, this won’t probably work out of the box, because the Angular CLI development server doesn’t answer at
/api/v1/people with an API. This is why you need to have some kind of proxy that intercepts such calls and proxies them to your correct backend server API. Let’s learn how to setup such proxy with the Angular CLI.
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