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425 Too Early

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The HyperText Transfer Protocol (HTTP) 425 Too Early response status code indicates that the server is unwilling to risk processing a request that might be replayed, which creates the potential for a replay attack.

Status

425 Too Early

Specifications

Specification Title
RFC 8470, section 5.2: 425: Early Data Using Early Data in HTTP

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
425 ? ? 58 ? ? ?
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
425 ? ? 58 ? ? ?

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https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/425