# File lib/fog/orchestration/openstack/requests/cancel_update.rb, line 6
        def cancel_update(stack)
          request(
            :expects => 200,
            :method  => 'POST',
            :path    => "stacks/#{stack.stack_name}/#{stack.id}/actions",
            :body    => Fog::JSON.encode('cancel_update' => nil)
          )
        end