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Enables support for TLS 1.3 0-RTT, or early data. This allows some HTTP requests to be sent during the TLS handshake, decreasing latency by a round-trip. This is the TCP version of the analogous feature in QUIC.

Motivation

Early data is an optimization to make pages load faster. It has been successful in QUIC, and this enables a similar optimization in TLS 1.3 over TCP. Note that, while we call it "0-RTT", it is zero roundtrips from TLS itself. Unlike QUIC, requests sent in early data must still wait for a TCP roundtrip.

Documentation

Specification

Editor's draft

Status in Chromium

Internals>Network>SSL


In development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Shipped/Shipping
  • No signal
  • No signal
  • Positive

Owner

Last updated on 2021-05-10