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Rails now allows any static file header to be defined using the configuration option config.public_file_server.headers.
This also deprecates the former option static_cache_control that would only apply the header Cache-Control.

The config.force_ssl option will now force mails to use the protocol https for the host setup in config.action_mailer.default_url_options.

Lets say your application has multiple root endpoints depending on a constraint. You can now describe them using root entries in your config/routes.rb file instead of having to use get statements.

This will prevent issues when performing updates from different instances of a same record.

where will raise ArgumentError on unsupported types.