HSTS without IncludeSubdomains is often useless
1) Because if you forget to add Secure; to the session cookie, it will leak to http:// subdomain in some cases 2) Because http:// subdomain can Cookie Bomb/cookie force main domain or be used for phishing. That's why *by default* it must include subdomains as it's much more common scenario. Very few websites *intend* to leave their blog.app.com working over http:// while having everything else encrypted. Yes, many developers forget to add subdomains=true by default, believe me :)
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