I'm using the Mozilla SSL Configuration Generator to generate an Apache SSL configuration. I'm planning to serve the site fully via HTTPS and enable HSTS.
However, it's not clear to me why I should go with either a modern or intermediate profile and how this will affect users? For example, the oldest compatible Chrome version for the modern profile is Chrome 30. What happens in these scenarios with HTTPS and HSTS enabled?
1) User using Chrome 31 - Gets HTTPS & HSTS and everything works fine?
2) User using Chrome 29 - Gets...?