Front desk · HTTP Status Codes
1×× Informational
101 Switching Protocols
· filed 2026-07-18 · click a code to copy
HTTP 101 Switching Protocols is a informational-class status code defined in RFC9110. The server agrees to switch protocols as requested via the Upgrade header.
Informational responses tell the client the request was received and the conversation continues — they are interim, never final. On the wire, the response begins with the status line HTTP/1.1 101 Switching Protocols.