RequestWillBeSentEvent(requestId: RequestId, loaderId: LoaderId, documentURL: String, request: Request, timestamp: MonotonicTime, wallTime: TimeSinceEpoch, initiator: Initiator, redirectResponse: Response? = null, type: ResourceType? = null, frameId: FrameId? = null, hasUserGesture: Boolean? = null)
Fired when page is about to send HTTP request.