In February, we released the first preview of HTTP Strict Transport Security in Internet Explorer 11 in the Windows 10 Insider Preview. HSTS protects against variants of man-in-the-middle attacks that can strip TLS out of communications with a server, leaving the user vulnerable. Site developers can use the policy to secure connections by opting in to a preload list, which registers websites to be hardcoded by Microsoft Edge, Internet Explorer, and other browsers to redirect HTTP traffic to HTTPS.”]