Butterfly
Experimental data collection crawler
About this crawler
Butterfly is a web crawler identified by the regular-expression pattern Butterfly in the User-Agent request header. It is categorised as seo. Use the regex above to detect, log, allow, or block Butterfly traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.20%
Technical details
- Name
- Butterfly
- Pattern
Butterfly- Tags
- seo
- Reference
- http://labs.topsy.com/butterfly/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/5.0 (compatible; Butterfly/1.0; +http://labs.topsy.com/butterfly/) Gecko/2009032608 Firefox/3.0.8
Block this crawler
robots.txt — disallow Butterfly:
User-agent: Butterfly
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Butterfly [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Butterfly") {
return 403;
}
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