// REFERENCE
421 Misdirected Request
Class: 4xx
The request reached a server that can't respond to it (e.g. HTTP/2 connection reuse toward a domain that server doesn't cover). The client should reopen the connection.
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400
400 Bad Request 401
401 Unauthorized (not authenticated) 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable
400 Bad Request 401
401 Unauthorized (not authenticated) 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable
Semantics per RFC 9110 and the IANA status code registry. Educational content.