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HTTP Status Codes

HTTP 306 Unused

306 Unused

This status code is reserved and currently unused.

306 Unusedgeneral

Observed message

306 Unused

Why it happens

  • The server wants the client to follow a redirect or choose an alternate representation.
  • Application routing, canonical URL logic, or a proxy generated a redirection response.
  • Caching or protocol handling may affect how the redirect is interpreted and followed.

How to fix it

  1. Treat the response as an implementation-specific or unexpected server behavior and inspect the stack returning it.
  2. Check whether a proxy, framework, or custom application code is emitting a reserved or unused status code.
  3. Prefer a currently assigned status code if you control the application or API returning the response.

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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306 Unused: what it means and how to fix it | Error Atlas