101
Switching Protocols
Informational (1xx)·RFC 9110
What 101 means
The server agrees to switch protocols as requested by the client.
Most commonly seen when a connection is upgraded from HTTP to WebSocket via the Upgrade header.
Informational (1xx)
Provisional responses that tell the client the request was received and processing continues.
Other 1xx codes
FAQ — 101
What does HTTP 101 mean?
101 Switching Protocols: The server agrees to switch protocols as requested by the client. Most commonly seen when a connection is upgraded from HTTP to WebSocket via the Upgrade header.
Which class does status code 101 belong to?
101 is a Informational (1xx) code. Provisional responses that tell the client the request was received and processing continues.
Where is the 101 code defined?
Status code 101 is defined in RFC 9110 and is part of the IANA HTTP Status Code Registry.