---
title: "earlyDataEnabled(_:)"
framework: Network
role: symbol
role_heading: Instance Method
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: "network/dtls/earlydataenabled(_:)"
---

# earlyDataEnabled(_:)

Enable early data (0-RTT) for DTLS.

## Declaration

```swift
func earlyDataEnabled(_ enabled: Bool) -> DTLS
```

## Parameters

- `enabled`: True to enable early data, false otherwise.

## Discussion

Discussion warning: This may have security implications for application data. In particular, DTLS early data is replayable by a network attacker. You must account for this when sending data before the handshake is confirmed. See RFC 8446 for more information. You MUST NOT enable fast open without a specific application profile that defines its use.