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.
説明
The server understands the Upgrade header field request and indicates which protocol it is switching to.
このコードが表示される場合
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
解決方法
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
説明
The request requires user authentication. The response includes a WWW-Authenticate header indicating the authentication scheme.
このコードが表示される場合
When accessing a protected resource without credentials or with expired tokens.
解決方法
Include valid authentication credentials (API key, Bearer token, Basic auth) in the Authorization header.
主な違い
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.
どちらをいつ使うか
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.