Relevant code: proxy_cache_valid 200 301 302 1d;
proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504; proxy_cache_background_update on; proxy_cache_lock on; The URL in question is obviously cached for 1 day. 15 minutes after the day is over, the proxy gets a request and tries to refresh the content but is met with an error (500) from the backend. In this case, will it continue to serve stale until it gets a proper new 200 content? - Quintin
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