Thank you for your explanation I have a question. Are there any directives for preventing multiple upstream and serving new content?
expect case: 1st request: get new content from origin and serve new content. 2nd request: serve new content. 3rd request: serve new content. "proxy_cache_use stale updating" and "proxy_cache_background_update off" case: 1st request: get new content from origin and serve new content. 2nd request: serve stale content. finish 1st request's upstream. 3rd request: serve new content. "proxy_cache_use stale updating" and "proxy_cache_background_update on" case: 1st request: serve stale content and make subrequest for getting new content. 2nd request: serve stale content. finish 1st request's subrequest. 3rd request: serve new content.
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