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# upgrade nginx
sudo add-apt-repository ppa:nginx/stable
sudo apt-get update
sudo apt-get install nginx

# cache
proxy_cache_path /path/to/cache levels=1:2 keys_zone=my_cache:10m max_size=10g
                 inactive=60m use_temp_path=off;

server {
...
    location / {
        proxy_cache my_cache;
        proxy_pass http://my_upstream;
    }
}