fasthttp
Fasthttp Go HTTP library
About this crawler
fasthttp is a web crawler identified by the regular-expression pattern fasthttp in the User-Agent request header. It is categorised as http-library. Use the regex above to detect, log, allow, or block fasthttp traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- fasthttp
- Pattern
fasthttp- Tags
- http-library
- Reference
- https://github.com/valyala/fasthttp
- Added
- 2026/05/09
- Instances
- 2 known sample(s)
Sample User-Agent strings
fasthttp
fasthttp, Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.101 Safari/537.36
Block this crawler
robots.txt — disallow fasthttp:
User-agent: fasthttp
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} fasthttp [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "fasthttp") {
return 403;
}
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