What this tool does
HTTP Status Codes lets you search common response codes by number, class, meaning, cause, and retry guidance.
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🌐 HTTP Status Codes
Search and explore every HTTP status code with clear meanings, common causes, and retry guidance for debugging APIs and websites.
Search by code or keyword, such as 429, timeout, redirect, cache, auth, or gateway.
Why it is useful
It helps developers, support teams, and site owners debug API responses, redirects, cache behavior, auth failures, and outages.
How it works
The browser filters a local reference list of status codes and displays plain-English meaning, causes, and retry guidance.
Best input
Search by code such as 404 or by keyword such as auth, timeout, redirect, gateway, or cache.
Debugging tip
Always pair the code with response headers, logs, request method, and URL context before deciding what to fix.
Privacy note
The reference lookup runs locally in your browser.
Important limitation
Status codes are signals, not complete diagnoses. Real causes depend on server logs, headers, proxies, caches, and client behavior.
Quick answers
Is 404 always an error?
It means the resource was not found for that request, but the cause may be a typo, deletion, route issue, or access pattern.
Should 5xx errors be retried?
Often with backoff, but retry guidance depends on idempotency and the API contract.
Common Use Cases
Debug API errors during development
Look up exactly what a 401, 403, 422, or 429 means and what to check first.
Understand redirect chains
See the difference between 301 permanent and 302 temporary redirects when auditing URL changes.
Plan retry logic for clients
Check whether a 429, 500, 502, or 503 should trigger a retry with backoff.
HTTP Developer Workbench workflow
Move between curl conversion, webhook testing, status-code reference, typed HTTP security diagnostics, redirect-chain analysis, status samples, MIME lookups, and user-agent parsing while keeping network behavior explicit.