HTTP 401 Unauthorized vs 403 Forbidden
Both HTTP 401 (Unauthorized) and 403 (Forbidden) belong to the 4xx Client Error category. 401 indicates that the request requires user authentication. The response includes a WWW-Authenticate header indicating the authentication scheme. Meanwhile, 403 means that the server understood the request but refuses to authorize it. Unlike 401, authentication will not help — the user simply does not have permission.
Description
The request requires user authentication. The response includes a WWW-Authenticate header indicating the authentication scheme.
When You See It
When accessing a protected resource without credentials or with expired tokens.
How to Fix
Include valid authentication credentials (API key, Bearer token, Basic auth) in the Authorization header.
Description
The server understood the request but refuses to authorize it. Unlike 401, authentication will not help — the user simply does not have permission.
When You See It
When trying to access a resource you're authenticated for but don't have permission to access.
How to Fix
Check your user role/permissions. Contact the admin to request access.
Key Differences
HTTP 401: The request requires user authentication. The response includes a WWW-Authenticate header indicating the authentication scheme.
HTTP 403: The server understood the request but refuses to authorize it. Unlike 401, authentication will not help — the user simply does not have permission.
You encounter 401 when when accessing a protected resource without credentials or with expired tokens.
You encounter 403 when when trying to access a resource you're authenticated for but don't have permission to access.
When to Use Which
For 401 (Unauthorized): Include valid authentication credentials (API key, Bearer token, Basic auth) in the Authorization header. For 403 (Forbidden): Check your user role/permissions. Contact the admin to request access.