File is not refreshed when using proxy_cache_use_stale

radarek nginx-forum at
Fri Feb 10 10:05:45 UTC 2012

I have following config:

location /images {
  proxy_redirect off;
  proxy_cache static-cache;
  proxy_cache_valid any 5m;
  proxy_cache_valid 404 5m;
  proxy_cache_use_stale updating invalid_header error timeout http_502;

The idea is that if backend server reply with error/timeout/invalid
header it will return stale version and cache it for 5m. Generally it
works ok but sometimes I have situation when one of my proxy cache
servers (I have 3 of them) returns stale version and will not refresh
file until I delete nginx cache files. Here is output from nginx -V:

$ nginx -V
nginx version: nginx/0.7.65
TLS SNI support enabled
configure arguments: --conf-path=/etc/nginx/nginx.conf
--error-log-path=/var/log/nginx/error.log --pid-path=/var/run/
--http-fastcgi-temp-path=/var/lib/nginx/fastcgi --with-debug
--with-http_stub_status_module --with-http_flv_module
--with-http_ssl_module --with-http_dav_module
--with-http_gzip_static_module --with-http_realip_module --with-mail
--with-mail_ssl_module --with-ipv6

Is it known problem or I am doing something wrong?

Posted at Nginx Forum:,222215,222215#msg-222215

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