The HTTP 101 Switching Protocols response code indicates a protocol to which the server switches. The protocol is specified in the Upgrade request header received from a client.
The server includes in this response an Upgrade response header to indicate the protocol it switched to. The process is described in the following article: Protocol upgrade mechanism.
101 Switching Protocols
Switching protocols might be used with WebSockets.
HTTP/1.1 101 Switching Protocols Upgrade: websocket Connection: Upgrade
| Specification |
|---|
| HTTP Semantics # status.101 |
Upgrade426 Upgrade Required
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/101