The HTTP 425 Too Early status code indicates that a request may be replayed and the server is unwilling to process it yet.
Published 16 Jul 2026 · HTTP Status Code
The 425 Too Early response helps prevent replay attacks when using early data mechanisms such as TLS 1.3 0-RTT.
This status code is mainly relevant when operating secure modern infrastructure.
425 Too Early indicates that processing the request may be unsafe at this time.
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The HTTP 426 Upgrade Required status code indicates that the client must switch to another protocol.
The HTTP 428 Precondition Required status code indicates that the request must contain conditional headers.
The HTTP 429 Too Many Requests status code indicates that a client has sent too many requests within a given time period...
