angular-external-modules

Install plugin CORS for chrome in order to accept requests to others servers.

Terminal session 1

cd backend
npm install
npm start
server listening on port 5000

Terminal session 2

cd serverA
npm install
npm start
server listening on port 5001

Terminal session 3

cd frontend
npm install
npm start

Go to http://localhost:4200 and click button ViewA.
Open browser console and look the error.