cache headers

gistfile1.rb

  def images
    
    ... authenticate
    ... get @images from somewhere
    ... get user_id and brochure_id from somewhere
    
    if stale?(:etag => Image.images_key(@images, "#{user_id},#{brochure_id}"))
      respond_to do |format|
        format.json { 
          response.headers['Cache-Control'] = 'public, max-age=2592000' # 1 month
          render :content_type => "application/json"; # render via view 
        }
      end
    end
    
  end