nginx-examples/image-proxy.conf

proxy_cache_path /var/cache/nginx/images levels=1:2 keys_zone=main_images:10m max_size=15g inactive=50d use_temp_path=on;
proxy_cache_valid 200 1d;
proxy_cache_valid 206 50d;
server {
    listen 80;
    #listen 443 ssl http2;
    #ssl_certificate /etc/letsencrypt/live/predelanet.ru/fullchain.pem;
    #ssl_certificate_key /etc/letsencrypt/live/predelanet.ru/privkey.pem;
    server_name slave.predelanet.ru;

    access_log  /var/log/nginx/slave.predelanet.ru/access.log  main;
    error_log /var/log/nginx/slave.predelanet.ru/error.log warn;

    charset utf8;
    index index.php;

    root /usr/share/nginx/html/images;

    location / {
        return 403;
    }

    location ~ ^/media/cache/images/(.*) {
        try_files /$1 @main;
    }

    location @main {
        proxy_pass https://www.predelanet.ru;
        proxy_cache main_images;
        proxy_cache_key $host$uri$is_args$args;
        proxy_http_version 1.1;
        proxy_ignore_headers Cache-Control;
        #proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}