Cache generated images

gistfile1.txt

server {
    listen 80; 

    server_name server.ru;

    location ~* ^/i/([^./]*) {
        proxy_ignore_headers Expires Cache-Control;
        proxy_cache_lock on; 
        proxy_cache_valid 24h;
        proxy_cache_valid 404 1m; 
        proxy_cache roommates;
        proxy_cache_key "$1-$arg_w-$arg_h";
        proxy_pass http://server.ru:8080;
    }   

    location / { 
        proxy_pass http://server.ru:8080;
    }   
}