← All HTTP status codes
101
Switching Protocols
The server agrees to switch protocols as requested via the Upgrade header (e.g. to WebSocket).
The 1xx class
1xx, Informational. Interim responses while the server continues processing: protocol switches, early hints. Rarely seen by end users.
Monitoring for this code
Informational responses are transient and rarely worth alerting on. If your monitoring captures one as a final response, check that your client follows the protocol upgrade or waits for the final status.
Other 1xx status codes
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