HTTP 101 Switching Protocols vs 425 Too Early
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 425 (Too Early) 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, 425 means that the server is unwilling to risk processing a request that might be replayed. Used with TLS 1.3 early data (0-RTT).
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 server is unwilling to risk processing a request that might be replayed. Used with TLS 1.3 early data (0-RTT).
このコードが表示される場合
When a server rejects a request sent as TLS 1.3 early data due to replay risk.
解決方法
Retry the request after the TLS handshake completes.
主な違い
101 is a 1xx Informational response, while 425 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 425: The server is unwilling to risk processing a request that might be replayed. Used with TLS 1.3 early data (0-RTT).
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 425 when when a server rejects a request sent as TLS 1.3 early data due to replay risk.
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 425 (Too Early): Retry the request after the TLS handshake completes.