HTTP Status Codes Reference — Quick Developer Guide

Searchable quick-reference for HTTP 1xx–5xx codes with practical context, common causes, and what to do.

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How to use HTTP Status Codes Reference — Quick Developer Guide

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Frequently asked questions

What is the difference between HTTP 401 and 403?

401 Unauthorized means the client is not authenticated — missing, expired, or invalid credentials. 403 Forbidden means the client is authenticated but not allowed to access that resource. Fix 401 by logging in or refreshing a token; fix 403 by changing roles or permissions.

What is the difference between 301 and 302 redirects?

301 Moved Permanently tells clients and search engines the new URL is the lasting home — browsers may cache it and SEO signals transfer. 302 Found is temporary; follow Location now, but keep using the original URL later. Use 307/308 when the HTTP method must stay the same.

What does HTTP 429 Too Many Requests mean?

The client hit a rate limit or quota. Read the Retry-After header if present, then retry with exponential backoff (1s, 2s, 4s, 8s). Slow down loops, cache responses, and avoid hammering login endpoints.

When should an API return 422 vs 400?

400 Bad Request is for a malformed request — invalid JSON, missing Content-Type, broken query string. 422 Unprocessable Entity is for a well-formed request that fails business rules, such as an invalid email or a negative age. Many APIs still use 400 for both; 422 is clearer for field validation.

Is this reference free?

Yes. It runs in your browser with no signup. Nothing is sent to a server.