// REFERENCE
407 Proxy Authentication Required
Class: 4xx
Like 401, but authentication is required by an intermediate proxy, not the final server. The response carries Proxy-Authenticate. Typical on corporate networks with a proxy.
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Related
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.