cache problem - not expiring

[Maxim Dounin]

Hello!

On Fri, Mar 11, 2011 at 09:58:27AM +0100, Hajo Locke wrote:

> nginx 0.8.49
> 
> Hello List,
> 
> have a problem with cached images which dont want to expire from cache.
> i use nginx as proxy with 2 ApacheBackends. On backend an image was
> updated by ftp but nginx still serves cached image for hours. i had
> to delete it manually...
> in nginx.conf i use:
> 
> proxy_cache_min_uses       1;
> proxy_cache_valid         200 5m;
> proxy_cache_path          /usr/local/nginx/proxy_temp/ levels=1:2
> keys_zone=ramdisk:1000m inactive=10m max_size=2000M;
> 
> I need some help, in which direction i should look for problems?

Check headers (Expires, Cache-Control) returned by backends.  They 
take precedence over proxy_cache_valid specified (unless ignored 
with proxy_cache_ignore_headers).

Maxim Dounin