Rails CORS

application_controller.rb

  before_filter :cors_preflight_check
  after_filter :cors_set_access_control_headers

  def cors_set_access_control_headers
    headers['Access-Control-Allow-Origin'] = '*'
    headers['Access-Control-Allow-Methods'] = 'POST, GET, PUT, DELETE, OPTIONS'
    headers['Access-Control-Allow-Headers'] = 'Origin, Content-Type, Accept, Authorization, Token'
    headers['Access-Control-Max-Age'] = "1728000"
  end

  def cors_preflight_check
    if request.method == 'OPTIONS'
      headers['Access-Control-Allow-Origin'] = '*'
      headers['Access-Control-Allow-Methods'] = 'POST, GET, PUT, DELETE, OPTIONS'
      headers['Access-Control-Allow-Headers'] = 'X-Requested-With, X-Prototype-Version, Token, X-Blueprint-Token, Content-Type'
      headers['Access-Control-Max-Age'] = '1728000'

      render :text => '', :content_type => 'text/plain'
    end
  end

  def handle_options_request
    head(:ok)
  end

routes.rb

  match '*path', controller: 'application', action: 'handle_options_request', via: [:options]