HTTP Status Codes
Look up any HTTP status code, from 100 Continue to 511, with a plain-English explanation. Search by number, name or meaning.
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How to use HTTP Status Codes
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About HTTP Status Codes
Type a code such as 404, a class such as 4xx, or a word such as redirect or cache. Codes follow RFC 9110 and the WebDAV and other registered extensions you meet in real APIs.
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HTTP Status Codes: frequently asked questions
What does an HTTP status code mean?
Type the code, such as 404, and read a plain-English explanation. You can also search a class such as 4xx or a word such as redirect.
Which codes are covered?
Codes from RFC 9110 plus WebDAV and other registered extensions you meet in real APIs, from 100 to 511.
What is the difference between 4xx and 5xx?
4xx codes describe a problem with the request, such as a missing page; 5xx codes mean the server failed to handle a valid request.
Does it check my website’s status?
No. It is a reference; nothing is requested from other sites.