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.

Learning resources on MDN

• Early-Data
• 425 Too Early

Browser support

• Chrome ❌ See 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 ❌

View web-platform-tests results for this feature - View the feature source file - Edit the feature - Report an issue about this feature