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HTTP Status Codes

HTTP 101 Switching Protocols

101 Switching Protocols

The server is switching protocols as requested by the client, usually after an Upgrade header negotiation.

101 Switching Protocolsgeneral

Observed message

101 Switching Protocols

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 Continue102 ProcessingHTTP 102 Processing103 Early HintsHTTP 103 Early Hints104 Upload Resumption SupportedHTTP 104 Upload Resumption Supported

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101 Switching Protocols: what it means and how to fix it | Error Atlas