您可以从Last-Modified rel ="nofollow"> $http_response_header 并使用它来触摸文件.

You can get cached Last-Modified from $http_response_header and use it to touch the file.

要完全自动化它显然是不可能的，因为流无法知道您要将其存储在何处.

To automate it completely is obviously not possible as the stream cannot know where are you going to store it.