How to block Greppr Web Crawler
Operated by Greppr. is a search engine crawler that indexes web content for Greppr, a search engine that focuses on providing unfiltered search results without tracking or… Search Engine Crawler Systematically scans and indexes web pages to include in search results
How it identifies itself
Mozilla/5.0 (compatible; Greppr Web Crawler/0.12.0 (https://greppr.org/))
robots.txt
What the agent asks to be told. It obeys this or it does not — nothing enforces it.
User-agent: Greppr 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 ~* "(Greppr|Greppr Web Crawler)") {
return 403;
}
Apache
In .htaccess or the vhost.
BrowserMatchNoCase "Greppr" bad_bot
BrowserMatchNoCase "Greppr Web 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 "Greppr") or (http.user_agent contains "Greppr Web 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 (['Greppr', 'Greppr Web Crawler'] as $needle) {
if (stripos($agent, $needle) !== false) {
status_header(403);
exit('Blocked: Greppr Web Crawler');
}
}
});
robots.txt is a request. The rules below it are the wall.
Greppr Web 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.