proxy_cache_path /var/cache/nginx/builds levels=1:2
                 keys_zone=builds:10m max_size=2g
                 inactive=30d use_temp_path=off;

server {
    listen 3000;

    location / {
        proxy_pass $BUCKET_ORIGIN;
        proxy_cache builds;
        proxy_cache_valid 200 30d;
        proxy_cache_valid 404 1m;
        proxy_intercept_errors on;

        proxy_hide_header x-amz-request-id;
        proxy_hide_header x-amz-id-2;
        proxy_hide_header x-amz-meta-s3cmd-attrs;
        proxy_hide_header Set-Cookie;
        proxy_ignore_headers Set-Cookie;

        proxy_set_header Host $BUCKET_HOST;
        proxy_set_header Cookie "";
        proxy_set_header Authorization "";

        add_header X-Cache-Status $upstream_cache_status;
    }
}