This extension is part of the Rack::Protection project. Run gem install rack-protection to have it available.

Prevented attack

Protects against against protocol downgrade attacks and cookie hijacking.

Supported browsers


More infos


browser will prevent any communications from being sent over HTTP to the specified domain and will instead send all communications over HTTPS. It also prevents HTTPS click through prompts on browsers.



How long future requests to the domain should go over HTTPS; specified in seconds


If all present and future subdomains will be HTTPS


Allow this domain to be included in browsers HSTS preload list. See