425
HTTP 425 Too Early
4xx Client Error
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Tailwind
4xx Client Error
RFC 8470, Section 5.2
What is HTTP 425 Too Early?
The 425 (Too Early) status code indicates that the server is unwilling to risk processing a request that might be replayed. This is related to the Early Data mechanism in TLS 1.3 where a client can send data immediately after the handshake without waiting for the server to confirm receipt.
Common Use Cases
- TLS 1.3 early data (0-RTT) protection
- Preventing replay attacks