All HTTP status codes

HTTP 425 Too Early

Client Error

The server refuses to process a request sent in TLS early data (0-RTT) because it might be replayed.

Defined in RFC 8470

Common causes

  • TLS 1.3 0-RTT requests to replay-sensitive endpoints

How to fix it

  1. Retry after the TLS handshake completes (clients usually do automatically)

  2. Only allow idempotent requests in early data

Related status codes

400 Bad Request

The server can't or won't process the request because the client sent something malformed — invalid JSON, bad query parameters, broken headers or framing.

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