Search HTTP status codes, RFC specs, common causes, and backend handler snippets.
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Type any HTTP code (e.g., 404, 500, 429) or keyword into the search bar.
Read the official RFC definition, common failure scenarios, and troubleshooting causes.
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401 Unauthorized means authentication credentials are missing or invalid. 403 Forbidden means the user is authenticated, but lacks sufficient permissions or access rights to view the resource.
A 502 Bad Gateway occurs when a reverse proxy (like Nginx, Cloudflare, or AWS ALB) receives an invalid response or timeout from the upstream backend server.
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