Plaa

gistfile1.rb

# Origin of etag_matches?  https://github.com/rails/rails/blob/7511f9794df8f803f28306d378f9fefc28165886/actionpack/lib/action_dispatch/http/cache.rb

module ActionController

  class Request

    alias_method :etag_matches_original?, :etag_matches?

    def etag_matches?(etag)
      !env['HTTP_USER_AGENT'].include?('MSIE') && etag_matches_original?(etag)
    end

  end

  class Response

    alias_method :etag_original?, :etag?

    def etag?
      request.env['HTTP_USER_AGENT'].include?('MSIE') || etag_original?
    end

  end
end