Mime error with Angular 8 in Firebase Hosting

Be sure that in index.html the head includes:

<base href="/">

See: https://github.com/angular/angular-cli/issues/10325#issuecomment-399329033

This error also occurs when running Python servers on Windows machines where the Registry mime types are not set correctly.

See: https://github.com/pallets/flask/issues/1045#issuecomment-42202749