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Enable HSTS with IncludeSubdomains header by default for new apps #23852
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 :)
…th subdomains - We will reuse config.ssl_options for setting the HSTS settings.
- We will remove the initializer for old apps which are migrated to Rails 5 so that they are not affected by this breaking change.
- For old apps which are not setting any value for hsts[:subdomains], a deprecation warning will be shown saying that hsts[:subdomains] will be turned on by default in Rails 5.1. Currently it will be set to false for backward compatibility. - Adjusted tests to reflect this change.
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