About HSTS
HTTP Strict Transport Security (HSTS) is a web security standard, defined in RFC 6797, that tells browsers to connect to a website only over HTTPS. After a browser sees the HSTS header once, it automatically uses an encrypted connection for that site, even if the user types http:// or follows an old link.
How it works:
The website sends the Strict-Transport-Security response header with a max-age value that defines how long the rule applies. The optional includeSubDomains directive extends it to all subdomains, and preload allows the domain to be included in the HSTS preload list built into Chrome, Firefox, Safari and Edge, so the protection works even on the very first visit.
Why it matters:
HSTS protects visitors against protocol downgrade and cookie hijacking attacks, for example on public Wi-Fi networks, where an attacker could otherwise redirect the first unencrypted request. It is recommended by security guidelines and is a common part of modern website security configurations.
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