Will Nginx serve stale cache after expiry if was unable to refresh the cache?

Quintin Par quintinpar at gmail.com
Tue Oct 2 03:04:25 UTC 2018

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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