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HTTP Status Code Reference

Look up what any HTTP status code means and when to use it.

To look up an HTTP status code, type the number or a keyword. Each entry explains what the code means and when it applies, including the difference between 301 and 302 redirects and why 401 is about authentication rather than authorisation.

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Frequently asked questions

When should I use 301 versus 302?

Use 301 when a URL has permanently moved — search engines transfer ranking signals to the new URL and browsers cache the redirect. Use 302 for temporary moves such as A/B tests or maintenance pages.

What is the difference between 401 and 403?

401 means you are not authenticated — log in and try again. 403 means the server knows who you are and is still refusing. Confusingly, 401 is named "Unauthorized" but is about authentication.

How to use the http status code reference

  1. 1Enter or paste your filter.
  2. 2The result appears immediately — copy or download it.

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Put the working http status code reference on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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