425 Too Early
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The HTTP 425 Too Early client error response status code indicates that the server was unwilling to risk processing a request that might be replayed to avoid potential replay attacks.
If a client has interacted with a server recently, early data (also known as zero round-trip time (0-RTT) data) allows the client to send data to a server in the first round trip of a connection, without waiting for the TLS handshake to complete.
A client that sends a request in early data does not need to include the Early-Data header.
See Early-Data for more information.
Status
http
425 Too Early
Specifications
| Specification |
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| Using Early Data in HTTP # status |
Browser compatibility
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
- No support
- No support
- See implementation notes.