// REFERENCE
401 Unauthorized (not authenticated)
Class: 4xx
Valid authentication is missing: you're not logged in or the token/credential is invalid. Despite the name, it means «not authenticated». The response usually carries WWW-Authenticate.
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400
400 Bad Request 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable 408
408 Request Timeout
400 Bad Request 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable 408
408 Request Timeout
Semantics per RFC 9110 and the IANA status code registry. Educational content.