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TLS 1.3 sessions may be resumed more quickly by sending so-called early data to servers before the TLS handshake has finished. Also known as zero round-trip time resumption or 0-RTT.

Status

Limited availability

MDN documentation

Early-Data header
425 Too Early

Specifications

Using Early Data in HTTP, from HTTP Working Group (IETF).

Browser support

Chrome ❌ See crbug.com/789599 crbug.com/41272059
Chrome Android ❌ See crbug.com/41272059
Edge ❌ See crbug.com/41272059
Firefox 58 Released on 2018-01-23
Firefox for Android 58 Released on 2018-01-22
Safari ❌
Safari on iOS ❌

Web Platform Tests (WPT)

View the latest WPT test results for this feature

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