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HTTP Status Codes

HTTP 103 Early Hints

103 Early Hints

The server is sending preliminary response headers so the client can begin loading linked resources before the final response is ready.

103 Early Hintsgeneral

Observed message

103 Early Hints

Why it happens

  • The request triggered an informational response during negotiation, upload, or long-running processing.
  • The client and server exchanged interim response details before the final status code was sent.
  • A proxy, framework, or client surfaced the interim status directly for logging or debugging.

How to fix it

  1. Check the final response status as well as the interim status to understand the full request outcome.
  2. Review upload, streaming, or protocol negotiation behavior if the informational response is unexpected.
  3. Confirm whether any client library, proxy, or framework is surfacing interim responses in UI or logs.

Official reference

IANA: HTTP Status Code Registry

Related errors

100 ContinueHTTP 100 Continue101 Switching ProtocolsHTTP 101 Switching Protocols102 ProcessingHTTP 102 Processing104 Upload Resumption SupportedHTTP 104 Upload Resumption Supported

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103 Early Hints: what it means and how to fix it | Error Atlas