Hi, this bugs me for some time now. I have nginx 1.16.0 configured as following on proxy cache: proxy_cache_path /dev/shm/nginx_cache levels=1:2 keys_zone=proxy:1024m max_size=1024m inactive=60m; proxy_temp_path /dev/shm/nginx_proxy_tmp; proxy_cache_use_stale updating; proxy_cache_lock on; proxy_cache_lock_timeout 30s; Most of the time all is fine aby abr3 - Nginx Mailing List - English