# File lib/oauth/client/action_controller_request.rb, line 44
    def apply_oauth!
      return unless ActionController::TestRequest.use_oauth? && @oauth_options

      @oauth_helper = OAuth::Client::Helper.new(self, @oauth_options.merge(:request_uri => (respond_to?(:fullpath) ? fullpath : request_uri)))
      @oauth_helper.amend_user_agent_header(env)

      self.send("set_oauth_#{@oauth_options[:scheme]}")
    end