The best ways to connect to the server using Angular CLI
https://www.freecodecamp.org/news/the-best-ways-to-connect-to-the-server-using-angular-cli-b0c6b699716c/
Apr 2, 2018 · And here is the first obstacle that appears before every Angular CLI newbie: the Angular project runs on its own server (which runs by default at http://localhost:4200 ). Therefore, the requests to the API server are cross-domain, and, as you might know, the security of the web browser disallows the making of cross domain requests.
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