HTTP Status Codes Explained
Look up any HTTP status code: meaning, category and when it occurs. Searchable reference for 1xx to 5xx. Free.
Frequently asked questions
- How many status codes are listed?
- The 31 codes you will actually meet in practice, from 100 Continue to 504 Gateway Timeout.
- What do the colour bands mean?
- Green is success, blue is redirection, orange is a client error and red is a server error.
- Which code should my API return for validation errors?
- 422 Unprocessable Entity is the common choice: the request was understood but the content failed validation.
- Is 301 or 302 better for SEO?
- Use 301 for permanent moves so search engines transfer ranking to the new URL; 302 keeps the original URL indexed.
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