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HTTP Status Codes: Every Common Code (200, 301, 404, 500) with Meaning and When You See It, Searchable

Type a number (such as 40) or a word (such as redirect or timeout) to filter. The first digit is the class: 2 success, 3 redirect, 4 the client made a mistake, 5 the server failed.

Part of the suite: Web and network tools

CodeNameMeaningWhen you see it

FAQ

What is the difference between 301 and 302?

301 is a permanent move, so search engines transfer ranking to the new address; 302 is temporary and ranking stays put. For a permanent domain move use 301 (or 308 if the request method must be kept).

What is the difference between 401 and 403?

401 means you are not authenticated (no token, or a wrong one); 403 means you are authenticated but not allowed.

What is the difference between 404 and 410?

404 means not found and may come back; 410 means removed on purpose for good, and search engines tend to drop the page faster.

How do 502, 503 and 504 differ?

502: a proxy got a bad answer from the back end. 503: the service is temporarily unavailable (maintenance or overload). 504: the proxy waited too long for the back end.