401 Unauthorized
Explanation:
The 401 Unauthorized status code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource.
Usage:
This status is used when authentication is required and has either failed or not been provided. The client should re-request with the required credentials.
Attentions:
- 401 responses must include a WWW-Authenticate header field containing a challenge applicable to the requested resource.
- If the request already included authentication credentials, this response indicates that authorization has been refused for those credentials.
Sample:
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