When I run flutter doctor -v in Flutter version 2.10 stable channel, I get this new check:
[✓] HTTP Host Availability
• All required HTTP hosts are available
It is working alright but exactly is it?
After some research, I found this in the documentation.
It basically makes sure you can connect to hosts needed for Flutter development.
Dart file that answers the question on GitHub: https://github.com/flutter/flutter/blob/eb1a851f5843efb6cecab020467a2ffea48fd1d3/packages/flutter_tools/lib/src/http_host_validator.dart