How to block Bibliotheque Nacional de France Crawler
Operated by Bibliothèque nationale de France. Bibliothèque nationale de France's mission is to collect, catalog, preserve, enrich and communicate the national documentary heritage.
How it identifies itself
Bibliotheque Nacional de France Crawler
robots.txt
What the agent asks to be told. It obeys this or it does not — nothing enforces it.
User-agent: bnf.fr_bot Disallow: /
nginx
In the server block, then reload.
# In the server block. 403 rather than 444: a closed connection tells the
# operator nothing, and an agent that gets a status code can log it.
if ($http_user_agent ~* "(bnf.fr_bot|Bibliotheque|Bibliotheque Nacional de France Crawler)") {
return 403;
}
Apache
In .htaccess or the vhost.
BrowserMatchNoCase "bnf.fr_bot" bad_bot
BrowserMatchNoCase "Bibliotheque" bad_bot
BrowserMatchNoCase "Bibliotheque Nacional de France Crawler" bad_bot
<RequireAll>
Require all granted
Require not env bad_bot
</RequireAll>
Cloudflare
Security → WAF → Custom rules.
# Security → WAF → Custom rules, action: Block (http.user_agent contains "bnf.fr_bot") or (http.user_agent contains "Bibliotheque") or (http.user_agent contains "Bibliotheque Nacional de France Crawler")
WordPress
A child theme's functions.php, or a small plugin.
// functions.php of a child theme, or a small plugin. Runs before WordPress
// builds the page, so a blocked agent costs one PHP process and no queries.
add_action('init', function () {
$agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
foreach (['bnf.fr_bot', 'Bibliotheque', 'Bibliotheque Nacional de France Crawler'] as $needle) {
if (stripos($agent, $needle) !== false) {
status_header(403);
exit('Blocked: Bibliotheque Nacional de France Crawler');
}
}
});
robots.txt is a request. The rules below it are the wall.
Bibliotheque Nacional de France Crawler publishes a token, so the directive above will work for as long as it keeps honouring it — and nothing except its own good manners makes it. The server rules match on a header the requester sets, which stops the agent that says who it is and not the one that copies somebody else's name. Botscope verifies identity against DNS and published address ranges, records which check decided each request, and shows you the ones that lied.
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