---
title: additionalHTTPHeaderFields
framework: Network Extension
role: symbol
role_heading: Instance Property
platforms: [iOS 17.0+, iPadOS 17.0+, Mac Catalyst 17.0+, macOS 14.0+, tvOS 17.0+, visionOS 1.0+]
path: networkextension/nerelay/additionalhttpheaderfields
---

# additionalHTTPHeaderFields

A dictionary of additional HTTP headers to send as part of CONNECT requests to the relay.

## Declaration

```swift
var additionalHTTPHeaderFields: [String : String] { get set }
```

## See Also

### Configuring client properties

- [identityData](networkextension/nerelay/identitydata.md)
- [identityDataPassword](networkextension/nerelay/identitydatapassword.md)
- [syntheticDNSAnswerIPv4Prefix](networkextension/nerelay/syntheticdnsansweripv4prefix.md)
- [syntheticDNSAnswerIPv6Prefix](networkextension/nerelay/syntheticdnsansweripv6prefix.md)