Angular’s proxyConfig provides a convenient and efficient workaround for the CORS issue during development. It essentially acts as a reverse proxy, intercepting requests from your Angular application and forwarding them to the backend server.

The key benefit is that the browser sees all requests originating from the same origin (your Angular application’s development server), thus bypassing the CORS restrictions.

In essence, the workflow is as follows:

Your Angular application running on localhost:4200 makes a request to /api/data.
— The proxyConfig intercepts the request.
— The proxyConfig forwards the request to http://localhost:8080/api/data.
— The backend server processes the request and sends a response back to the proxyConfig.
— The proxyConfig relays the response back to your Angular application.

Since the request appears to originate from the same origin, the browser happily allows the communication, and you can seamlessly develop your Angular application without the CORS headache.