HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Categories: Security
Official website: https://www.rfc-editor.org/rfc/rfc6797#section-6.1
HSTS is ranked #1 of 316 in Security by website adoption.
WhatStack detects HSTS by analyzing HTTP headers, HTML source code, JavaScript globals, meta tags, cookies, DNS records, and ads.txt entries using signature-based pattern matching across 10 different analyzers.