rack-csrf-detector

Rails only protects you against CSRFs if you use GET and POST correctly. This middleware helps you identify when a GET request results in an application state-change.

rack-csrf-detector monkey-patches ActiveRecord to identify GET requests that cause a database commit. A CRSF-WARNING header is added to responses when this is detected. An accompanying chrome extension is available to alert when the header is present.

Add the following to your Gemfile

gem 'rack-csrf-detector', :require => 'rack/csrf_detector'

And include the middleware in your development.rb

config.middleware.use "Rack::CsrfDetector" do
  use Rack::CsrfDetector::ActiveRecordInstrument
  use Rack::CsrfDetector::SidekiqInstrument
end

Note: Do not run this in production.

You can also install the chrome extension:

More Tools | Extensions | Developer mode | Load Unpacked extension...

And select the chrome-extension folder in this repo.