Verified65% confidenceFactTime unknown
HTTP status code 401 (Unauthorized) is the standard authentication failure response in Web APIs, indicating that the request lacks valid identity credentials or that the credentials have expired.
3
Sources
65%
Confidence
Long-term
Relevance
5/31/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedServer-side token validation requires verifying the signature, that it has not expired, and that the audience is exactly this server; failure of any one check returns 401, and insufficient scope returns 403 Forbidden.65% similarUnverifiedThe HTTP 402 "Payment Required" status code has long been merely a placeholder in the protocol specification—defined but almost never actually used.65% similarUnverified使用无效的测试API Key会返回401鉴权失败错误64% similarUnverified401 and 403 authentication errors, as well as 400 errors related to request structure, should be thrown immediately and should not trigger a fallback.59% similarUnverifiedA protocol error means the request itself is malformed (e.g., calling a non-existent tool name) and is returned as a standard JSON-RPC error.59% similar
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