A Mozilla developer is proposing a Cache-Control extension so clients can identify responses that will not be updated during their freshness lifetimes. Related discussion.
An in-depth look at how to spin up reproducible (and easily-destructible), on-demand test environments with Docker, Amazon EC2 Container Service (ECS), and Circle CI (for continuous integration and delivery).
A future version of Chrome may force all domains ending on .dev (and .foo) to be redirected to HTTPs via a preloaded HTTP Strict Transport Security (HSTS) header.