Apache+Nginx кеширование картинок в браузере

Настроил, чтобы Nginx отдавал сайт из своего кеша.Нужно, чтобы браузер кешировал картинки.

Сейчас так:

Server: nginx

Date: Sat, 14 Apr 2012 09:34:56 GMT

Content-Type: text/html; charset=UTF-8

Transfer-Encoding: chunked

Connection: close

X-Powered-By: PHP/5.2.17

P3P: CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"

Etag: 2c0187b8225c556ddea9e68e268f2bd3

Cache-Control: no-cache

Pragma: no-cache

Content-Encoding: gzip



200 OK

Http

http {

    include       /etc/nginx/mime.types;

    default_type  application/octet-stream;



    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '

                      '$status $body_bytes_sent "$http_referer" '

                      '"$http_user_agent" "$http_x_forwarded_for"';



    access_log  /var/log/nginx/access.log  main;



    sendfile        on;

    tcp_nopush      on;

    tcp_nodelay     on;

    server_tokens   off;

    gzip            on;

    gzip_static     on;

    gzip_comp_level 5;

    gzip_min_length 1024;

    gzip_types          text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    keepalive_timeout  0;

    limit_conn_zone   $binary_remote_addr  zone=addr:10m;

proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=cache:30m max_size=100m;

proxy_temp_path /var/lib/nginx/tmp/proxy 1 2;

proxy_cache_use_stale error timeout invalid_header http_502;

proxy_cache_bypass $cookie_session;

proxy_no_cache $cookie_session;

    include /etc/nginx/conf.d/*.conf;

    client_max_body_size 16m;

    log_format  isp '$bytes_sent $request_length';

Server

server {

		listen xxx.xxx.xxx.xxx:80;

		server_name site.ru www.site.ru;

		rewrite ^(/manager/.*)$	https://$host$1	permanent;

		error_page 404 = @fallback;

		location ~* ^/(webstat/|awstats|webmail/|myadmin/|manimg/) {

			proxy_pass http://xxx.xxx.xxx.xxx:8080;

			proxy_redirect http://site.ru:8080/ /;

			proxy_set_header Host $host;

			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

			proxy_set_header X-Real-IP $remote_addr;

		}

		location / {

			proxy_pass http://xxx.xxx.xxx.xxx:8080;

			proxy_redirect http://site.ru:8080/ /;

			proxy_set_header Host $host;

			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

			proxy_set_header X-Real-IP $remote_addr;

		}

    proxy_cache cache;

    proxy_cache_valid 10m;

    proxy_cache_valid 404 1m;

		location ~* ^.+\.(jpg|jpeg|gif|png|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|tar|wav|bmp|rtf|swf|ico|flv|txt|xml|docx|xlsx)$ {

			access_log /var/www/httpd-logs/site.ru.access.log ;

			access_log /var/www/nginx-logs/user isp;

			set $proot "/var/www/user/data/www/site.ru";

			if ( $host = "site.ru" ) {

				break;

			}

			if ( $host = "www.site.ru" ) {

				break;

			}

			if ( $host ~* ^(.*).site.ru$ ) {

				set $proot /var/www/user/data/www/site.ru/$1;

				break;

			}

			root $proot;

		}

		location @fallback {

			proxy_pass http://xxx.xxx.xxx.xxx:8080;

			proxy_set_header Host $host;

			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

			proxy_set_header X-Real-IP $remote_addr;

		}

	}

Куда добавить expires, чтобы картинки открывались из кеша браузера?