101
Switching Protocols
1xx · Informational
The requester has asked the server to switch protocols.
What does HTTP 101 Switching Protocols mean?
Sent in response to an Upgrade request header, indicating the server is switching to a different protocol — most commonly when upgrading an HTTP connection to a WebSocket.
1xx responses are provisional — they tell the client the request was received and the process is continuing. They are rarely seen directly in everyday web development.
Related 1xx status codes
Look up and search every HTTP status code in one place.
Open the HTTP Status Code tool