Do a lot of local development and recently I've noticed that I cannot connect to non-HTTPS services running on localhost. If the services provide HTTPS then I am able to connect, but every time I try something like "http://devsite:8000", Safari always tries to access "https://devsite.local:8000".
Using Chrome, I can properly access the site.
Perhaps the issue is HSTS?
I am running Safari 10.1 on macOS Sierra.