id summary reporter owner description type status priority milestone component version resolution keywords cc uname nginx_version 2286 When I use the proxy_cache_background_update and proxy_cache_use_stale parameter, the expired cache content cannot be returned quickly. magicgaro@… "When I use the proxy_cache_background_update on; proxy_cache_use_stale timeout updating;parameter, the expired cache content can't be returned quickly.It seems to be delayed by 200 milliseconds.The following is the process. backend server i use sleep 5 second. {{{ 1.cache miss response time 5s. # time curl -i -H ""Host:test.lua"" ""127.0.0.1"" HTTP/1.1 200 OK Cache: MISS real 0m5.085s 2. cache hit response time 0.004s # time curl -i -H ""Host:test.lua"" ""127.0.0.1"" HTTP/1.1 200 OK Cache: HIT real 0m0.004s 3.cache stale response time 0.205s. (This is obviously unreasonable.) # time curl -i -H ""Host:test.lua"" ""127.0.0.1"" HTTP/1.1 200 OK Cache: STALE real 0m0.205s 4.cache updating response time 0.04s # time curl -i -H ""Host:test.lua"" ""127.0.0.1"" HTTP/1.1 200 OK Cache: UPDATING real 0m0.004s }}} Is this a bug or is it designed like this? " defect closed minor nginx-core 1.19.x wontfix background update magicgaro@… Linux localhost.localdomain 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux "nginx version: nginx/1.19.9 built by gcc 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) built with OpenSSL 1.1.1l 24 Aug 2021 TLS SNI support enabled configure arguments: --prefix=/usr/local/nginx --with-debug --with-cc-opt='-DNGX_LUA_USE_ASSERT -DNGX_LUA_ABORT_AT_PANIC -O2' --add-module=../ngx_devel_kit-0.3.1 --add-module=../echo-nginx-module-0.62 --add-module=../xss-nginx-module-0.06 --add-module=../ngx_coolkit-0.2 --add-module=../set-misc-nginx-module-0.32 --add-module=../form-input-nginx-module-0.12 --add-module=../encrypted-session-nginx-module-0.08 --add-module=../srcache-nginx-module-0.32 --add-module=../ngx_lua-0.10.20 --add-module=../ngx_lua_upstream-0.07 --add-module=../headers-more-nginx-module-0.33 --add-module=../array-var-nginx-module-0.05 --add-module=../memc-nginx-module-0.19 --add-module=../redis2-nginx-module-0.15 --add-module=../redis-nginx-module-0.3.7 --add-module=../rds-json-nginx-module-0.15 --add-module=../rds-csv-nginx-module-0.09 --add-module=../ngx_stream_lua-0.0.10 --with-ld-opt=-Wl,-rpath,/usr/local/nginx/luajit/lib --with-http_stub_status_module --with-http_ssl_module --with-http_realip_module --with-http_geoip_module --with-threads --with-http_v2_module --with-http_stub_status_module --with-http_sub_module --with-threads"