proxy_cache not working

[dekar411]

Greetings

I'm trying to setup reverse proxy cache but the cache path is always
empty and tcpdump tells me there is no caching. Here is my configuration
(all non-mentioned files are default):

$ cat /etc/nginx/conf.d/cache.conf 
proxy_cache_path  /var/cache/nginx levels=1:2 keys_zone=disk-cache:8m
max_size=1000m inactive=600m;
proxy_temp_path /tmp/nginx;

/etc/nginx/sites-enabled/default:
      location ~ ^/userProfileConfig($|/.*) {

        proxy_cache disk-cache;
        proxy_cache_valid any 1m;

        proxy_pass    http://10.82.0.150:8888;
        proxy_redirect    off;
        proxy_buffering on;

        proxy_set_header    HOST    $host;
        proxy_set_header    X-Real-IP    $remote_addr;
        proxy_set_header    X-Forwarded-For   
$proxy_add_x_forwarded_for;
        proxy_set_header    X-Forwarded-Proto  $scheme;

        access_log  /var/log/nginx/access.test.log;
        error_log /var/log/nginx/error.test.log info;

    }

There are no errors.

Additional info:

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.2 LTS"

$ 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/nginx.pid
--lock-path=/var/lock/nginx.lock
--http-log-path=/var/log/nginx/access.log
--http-client-body-temp-path=/var/lib/nginx/body
--http-proxy-temp-path=/var/lib/nginx/proxy
--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
--add-module=/build/buildd/nginx-0.7.65/modules/nginx-upstream-fair

$ curl http://192.168.122.22/userProfileConfig/1/1
<?xml version='1.0' encoding='UTF-8'?>...............

$ cat /var/log/nginx/access.test.log
192.168.122.1 - - [23/Jun/2011:11:40:53 +0200] "GET
/userProfileConfig/1/1 HTTP/1.1" 200 1123 "-" "Mozilla/5.0 (X11; Linux
x86_64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1"
192.168.122.1 - - [23/Jun/2011:11:44:01 +0200] "GET
/userProfileConfig/1/1 HTTP/1.1" 200 1123 "-" "curl/7.21.3
(x86_64-pc-linux-gnu) libcurl/7.21.3 OpenSSL/0.9.8o zlib/1.2.3.4
libidn/1.18"

$ sudo du -h /var/cache/nginx/
4.0K	/var/cache/nginx/

$ ls -l /var/cache/ | grep nginx
drwx------  2 www-data root 4096 2011-06-23 11:41 nginx

Any help will be greatly appreciated.

Thanks in advance.
David.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,209334,209334#msg-209334