Parsing.swift

extension Provider {
    func requestEmpty<T: TargetType>(target: T) -> Observable<GravityResponse<Void>> {
        requestData(target: target).then(decode)
    }

    private func decode(response: GravityResponse<Data>) -> Observable<GravityResponse<Void>> {
        response.map { $0.map { _ in } }
            .subscribe(on: ConcurrentDispatchQueueScheduler(qos: .utility))
            .observe(on: MainScheduler.instance)
    }
}