http {
    proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=api_cache:10m max_size=1g inactive=365d;
    server {
        listen 3000;
        location /health {
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }

        location / {
            proxy_cache api_cache;
            proxy_cache_valid 200 365d;
            # Only cache if X-Cache header is present
            proxy_cache_bypass $http_x_cache_inverse;
            proxy_no_cache $http_x_cache_inverse;
            # Set inverse variable (cache disabled by default)
            set $http_x_cache_inverse 1;
            if ($http_x_cache) {
                set $http_x_cache_inverse 0;
            }
            proxy_cache_key $scheme$proxy_host$uri$is_args$args;
            proxy_pass $arg_url;
            add_header X-Cache-Status $upstream_cache_status;
        }
    }
}