server {
    listen       80;
    listen  [::]:80;
    server_name  localhost;

    add_header X-Robots-Tag "noai, noimageai" always;

    # ── robots.txt — exempt from bot blocking ──────────────────────────
    location = /robots.txt {
        try_files $uri =404;
        access_log off;
        log_not_found off;
    }

    # ── Block known AI bots ────────────────────────────────────────────
    # "if" is safe here — we're only returning a status, not using
    # proxy_pass, rewrite, or other directives that interact poorly with if
    location / {
        if ($bad_bot) {
            return 403 "Forbidden";
        }

        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}