retainCycle2.swift

service
  .flatMap { [weak self] text -> Observable<Void> in
  guard let self = self else { return .empty() }
  .
  .
  .
  return self.network
    .request(url: url)
    .do(onNext: { response in
      self.status.value = .success(response)
    }, onError: { _ in
      self.fetchStatus()
        .subscribe()
        .disposed(by: self.bag)
    })
  }
}