Discourse Forum Onebox
Forum link preview and embed content fetcher
About this crawler
Discourse Forum Onebox is a web crawler identified by the regular-expression pattern Discourse Forum Onebox in the User-Agent request header. It is categorised as social-preview. Use the regex above to detect, log, allow, or block Discourse Forum Onebox traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
No block-rate data for this crawler.
Technical details
- Name
- Discourse Forum Onebox
- Pattern
Discourse Forum Onebox- Tags
- social-preview
- Reference
- https://discourse.org/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Discourse Forum Onebox v3.3.0.beta1-dev
Block this crawler
robots.txt — disallow Discourse Forum Onebox:
User-agent: Discourse Forum Onebox
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Discourse Forum Onebox [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Discourse Forum Onebox") {
return 403;
}
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