RFC 6797 defined HTTP Strict Transport Security in November 2012. This is an explanation of an established standard, not a new October requirement. HSTS lets a site tell a browser to use HTTPS for future connections; an ordinary HTTP redirect first requires a request that may still travel without encryption.

MDN explains the first-visit limitation: a browser that has not learned the policy can initially connect over HTTP. A remembered HSTS policy changes later requests before that connection. Browser preloading can address this initial gap, but adding a header is not the same as having a domain included in browser preload lists.

For hosting procurement, ask who maintains certificates, where the header is applied and which subdomains are covered. The includeSubDomains directive extends the policy beyond the main host. Inventory those services before enabling it; an old subdomain without working HTTPS can become inaccessible to browsers enforcing the policy.

The practical decision is operational: require a documented HTTPS rollout and certificate-renewal process, not just an HSTS checkbox. The policy does not certify the honesty of a shop or eliminate application vulnerabilities. YNIX has not audited a hosting provider here, and this briefing makes no change to any domain.