I will forget this if I don’t get it written down, and I’m hoping that someone else will find this useful as well. If you’re having trouble accessing http://localhost from your development machine (for instance, http://locahost:4200 when starting an Angular application), you can do the following, at least for the Edge and Chrome browsers.
Open your Edge or Chrome browser, and go to edge://net-internals/#hsts or chrome://net-internals/#hsts, as applicable. At the very bottom (at least at the time of this writing), you’ll find a section called
Delete domain security policies. Here, enter
localhost into the Domain box, then click on the Delete button. You should now be able to access localhost from http on your development machine.