HTTP 101 Switching Protocols vs 401 Unauthorized
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 401 (Unauthorized) is a 4xx Client Error response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 401 means that the request requires user authentication. The response includes a WWW-Authenticate header indicating the authentication scheme.
Descripción
The server understands the Upgrade header field request and indicates which protocol it is switching to.
Cuándo lo verás
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
Cómo solucionarlo
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
Descripción
The request requires user authentication. The response includes a WWW-Authenticate header indicating the authentication scheme.
Cuándo lo verás
When accessing a protected resource without credentials or with expired tokens.
Cómo solucionarlo
Include valid authentication credentials (API key, Bearer token, Basic auth) in the Authorization header.
Diferencias clave
101 is a 1xx Informational response, while 401 is a 4xx Client Error response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 401: The request requires user authentication. The response includes a WWW-Authenticate header indicating the authentication scheme.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 401 when when accessing a protected resource without credentials or with expired tokens.
Cuándo usar cada uno
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 401 (Unauthorized): Include valid authentication credentials (API key, Bearer token, Basic auth) in the Authorization header.