Low adoption rate of HSTS website security mechanism is worrying, EFF says
"Without HSTS, browsers have no way of knowing that a website should be delivered securely, and so cannot alert you when a website that ought to be loaded securely (e.g. your bank's website) is instead loaded via a normal connection (i.e. the unencrypted version the attacker sends to you instead)," said Jeremy Gillula, a staff technologist at the EFF, in a blog post Friday. "HSTS fixes that by allowing servers to send a message to the browser saying 'Hey! Connections to me should be encrypted!' and allowing browsers to understand and act on that message."