---
title: AdditionalHeaderFieldsAreSupported
framework: bundleresources
role: symbol
role_heading: Property List Key
path: bundleresources/information-property-list/aswebauthenticationsessionwebbrowsersupportcapabilities/additionalheaderfieldsaresupported
---

# AdditionalHeaderFieldsAreSupported

A Boolean that indicates whether the app supports additional header fields in requests.

## Discussion

Discussion Set the corresponding value to YES to indicate that your browser uses the additionalHeaderFields property of an ASWebAuthenticationSessionRequest. important: If the system doesn’t find this key in the default browser app’s Info.plist, it sends the request to Safari instead.

## See Also

### Capabilities

- [IsSupported](bundleresources/information-property-list/aswebauthenticationsessionwebbrowsersupportcapabilities/issupported.md)
- [EphemeralBrowserSessionIsSupported](bundleresources/information-property-list/aswebauthenticationsessionwebbrowsersupportcapabilities/ephemeralbrowsersessionissupported.md)
- [CallbackURLMatchingIsSupported](bundleresources/information-property-list/aswebauthenticationsessionwebbrowsersupportcapabilities/callbackurlmatchingissupported.md)