Hello World
Test crawler sending generic requests to verify web server responses
About this crawler
Hello World is a web crawler identified by the regular-expression pattern Hello World in the User-Agent request header. It is categorised as seo. Use the regex above to detect, log, allow, or block Hello World traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.33%
Technical details
- Name
- Hello World
- Pattern
Hello World- Tags
- seo
- Reference
- https://datadome.co/bots/hello-world/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Hello World
Block this crawler
robots.txt — disallow Hello World:
User-agent: Hello World
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Hello World [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Hello World") {
return 403;
}
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