101 Switching Protocols

Meaning

Informational responses indicate the request is being processed.

Causes

• Request or response flow is affected by the status meaning.
• Headers or request body may require changes.

How to fix

• Check request format and headers.
• Retry after updating the request or following redirect guidance.

Example

HTTP/1.1 101 Switching Protocols

Official references

IANA HTTP Status Code RegistryOfficialRegistryhttps://www.iana.org/assignments/http-status-codesOpen in new tab MDN HTTP response status codesReferenceDocshttps://developer.mozilla.org/en-US/docs/Web/HTTP/StatusOpen in new tab RFC 9110 (HTTP Semantics)ReferenceSpechttps://www.rfc-editor.org/rfc/rfc9110Open in new tab RFC 9110: 101 status codeReferenceSpechttps://www.rfc-editor.org/rfc/rfc9110Open in new tab

FAQ

• Is this my problem or the server’s? — It depends on the status class (4xx vs 5xx).
• What should I check first? — Start with the request URL, headers, and body.

When to contact support

If it persists, contact the service owner.