요약
Authentication is required and has failed or not been provided (i.e. unauthenticated).
언제 발생하나
Returned when credentials are missing or invalid; response includes a WWW-Authenticate header.
흔한 원인
- Missing or expired access token
- Wrong username/password or API key
- Token audience/scope mismatch
해결 방법
- Authenticate or log in again
- Refresh the access token
- Send a valid Authorization header
- Verify the API key and its permissions