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HTTP Status Codes

HTTP 421 Misdirected Request

421 Misdirected Request

The request was directed to a server that is not able to produce a response for the target URI.

421 Misdirected Requestgeneral

Observed message

421 Misdirected Request

Why it happens

  • The request could not be fulfilled because of client-side syntax, state, authorization, or precondition issues.
  • Headers, payload shape, request metadata, or client expectations do not match what the server requires.
  • An application, proxy, or security layer rejected the request before normal processing could complete.

How to fix it

  1. Inspect the exact request URL, headers, body, and protocol details being sent.
  2. Review server expectations for authentication, validation, conditional headers, or resource state.
  3. Check proxies, API gateways, and middleware that might reject the request before it reaches the application.

Official reference

IANA: HTTP Status Code Registry

Related errors

100 ContinueHTTP 100 Continue101 Switching ProtocolsHTTP 101 Switching Protocols102 ProcessingHTTP 102 Processing103 Early HintsHTTP 103 Early Hints

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421 Misdirected Request: what it means and how to fix it | Error Atlas