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HTTP Status Codes

HTTP 304 Not Modified

304 Not Modified

The resource has not changed since the client's conditional request, so the cached version can be reused.

304 Not Modifiedgeneral

Observed message

304 Not Modified

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. Check the Location header and verify that the redirect target or alternate resource is correct.
  2. Review application routing, proxy rules, and canonical URL settings.
  3. Make sure the client handles the specific redirect semantics for method preservation and caching.

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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304 Not Modified: what it means and how to fix it | Error Atlas