Tools

These utilities fetch URLs from 404Buddy servers. We block obvious SSRF targets in production—if you need to test private hosts, run locally with ALLOW_PRIVATE_URL_FETCH=true.

URL status checker
Final HTTP status, final URL after redirects, and rough timing.
Redirect checker
See each hop in a redirect chain—great for spotting loops.
Header checker
Response headers after redirects—sorted for quick scanning.
Broken link checker
Crawl links on a page and flag bad status codes (within safe limits).
Canonical checker
Compare rel=canonical and Link headers with the final URL.
Robots.txt checker
Read robots.txt for any public origin.
Sitemap checker
Count and sample URLs from an XML sitemap.