Status code 401 is common with?

Status code 401 is common with?

• A. API related errors
• B. Successful responses
• C. Redirection
• D. Client side caching

Answer: (A)

401 Unauthorized means the request cannot be processed because valid authentication credentials are missing or have failed for the target resource. This is most common in API interactions, where endpoints require an API key or a bearer token in the Authorization header. If credentials are missing, expired, or invalid, the server returns this status to ask the client to re-authenticate, often accompanied by a WWW-Authenticate header describing the required method. This is not a successful response, and it isn’t a redirection. It also isn’t about caching by itself. To fix it, provide valid credentials or refresh the authentication token and retry.

401 Unauthorized means the request cannot be processed because valid authentication credentials are missing or have failed for the target resource. This is most common in API interactions, where endpoints require an API key or a bearer token in the Authorization header. If credentials are missing, expired, or invalid, the server returns this status to ask the client to re-authenticate, often accompanied by a WWW-Authenticate header describing the required method. This is not a successful response, and it isn’t a redirection. It also isn’t about caching by itself. To fix it, provide valid credentials or refresh the authentication token and retry.