The issue is really made me crazy while it’s happened on my local environment after upgrade my MacOS to catalina 10.15.2.
I have already followed the following article but still it was issue to access the local dev on my Mac => How to Delete HSTS Settings in Chrome
The fix is to type the word “thisisunsafe” once you get to the page that says “Your connection is not private” . Just click somewhere on the page and then blindly type thisisunsafe. This will immediately bypass the warning. Please don’t do on sites you don’t trust.
Which I found the following article to avoid the issue easily.
Moyen Uddin 