The key to an extra Android.Runtime.JavaList of Android.OS.Bundles that contains key/value pairs. All the values and the keys are Java.Lang.Strings. Each key/value pair represents an extra HTTP header. The keys can't be the standard HTTP headers as they are set by the WebView. A list of size 1 may be provided to apply the same HTTP headers to all web results. A list of the same size as RecognizerResultsIntent.ExtraVoiceSearchResultStrings may be provided to apply different HTTP headers to each different web result in the list. These headers will only be used in the case that the url for a particular web result (from RecognizerResultsIntent.ExtraVoiceSearchResultUrls) is loaded.