Add this line to your application's Gemfile:

gem 'rails_response_headers'

And then execute:

$ bundle

Create a YAML file at config/response-headers.yml with a mapping from your controller actions to the set of headers which should be set in the response. For example:

# config/response-headers.yml

welcome#index:
  Surrogate-Control: public, max-age=120
  Vary: Accept-Encoding, Accept-Language

When the index action of WelcomeController is hit, Surrogate-Control and Vary headers will be included in the response.

Bug reports and pull requests are welcome on GitHub at https://github.com/efforg/rails_response_headers.

The gem is available as open source under the terms of the MIT License.