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HTTP Status Codes

Complete reference for all standard HTTP status codes 1xx–5xx. Runs entirely in your browser.

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Reference for all standard HTTP status codes. Click any code to see detailed explanation and usage notes.

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About HTTP Status Codes

HTTP status codes are three-digit numbers returned by a server in response to a client request. They are grouped into five classes:

  • 1xx Informational – Request received, continuing process.
  • 2xx Success – Request was successfully received, understood, and accepted.
  • 3xx Redirection – Further action needs to be taken to complete the request.
  • 4xx Client Error – The request contains bad syntax or cannot be fulfilled.
  • 5xx Server Error – The server failed to fulfil an apparently valid request.

Status codes are defined primarily in RFC 9110 (HTTP Semantics) and extended by other RFCs and standards such as WebDAV.