Fix · Cloudflare

Fix “HTTP Strict Transport Security (HSTS)” on Cloudflare

Add: Strict-Transport-Security: max-age=63072000; includeSubDomains; preload

// Transform Rules > Modify Response Header > Set static
// Strict-Transport-Security = max-age=63072000; includeSubDomains; preload

Verify the fix

Re-run the HTTP Strict Transport Security (HSTS) check after deploying. Test config changes in staging first and keep a rollback: a wrong header can break a site faster than a missing one.

Other stacks: nginx · Apache · Caddy · Express / Node

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