401 не открывается presentAuthenticationController ()

Question

Я пытаюсь создать устройство, работающее с turbolinks-iOS, и мне кажется, что я что-то упустил.

На iOS я пытаюсь показать защищенный вид: localhost:3000/lists Ожидаемый результат - открытие моего AuthentificationController, но вместо этого представление загружается нормально.

На стороне Rails сервер отвечает:

Started GET "/lists" for 127.0.0.1 at 2019-03-29 15:06:35 +0100
Processing by ListsController#index as HTML
Completed 401 Unauthorized in 10ms (ActiveRecord: 0.0ms)


Started GET "/account/sign_in" for 127.0.0.1 at 2019-03-29 15:06:36 +0100
Processing by Users::SessionsController#new as HTML
...

Полный ApplicationController (остальные файлы такие же, как TurbolinksDemo https://github.com/turbolinks/turbolinks-ios/blob/master/TurbolinksDemo)

import UIKit
import WebKit
import Turbolinks

class ApplicationController: UINavigationController {
    fileprivate let url = URL(string: "http://localhost:3000")!
    fileprivate let webViewProcessPool = WKProcessPool()

    fileprivate var application: UIApplication {
        return UIApplication.shared
    }

    fileprivate lazy var webViewConfiguration: WKWebViewConfiguration = {
        let configuration = WKWebViewConfiguration()
        configuration.processPool = self.webViewProcessPool
        configuration.applicationNameForUserAgent = "App"
        return configuration
    }()

    fileprivate lazy var session: Session = {
        let session = Session(webViewConfiguration: self.webViewConfiguration)
        session.delegate = self
        return session
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        navigationBar.isTranslucent = false
        presentVisitableForSession(session, url: url.appendingPathComponent("lists"))
    }

    fileprivate func presentVisitableForSession(_ session: Session, url: URL, action: Action = .Advance) {
        let visitable = MyViewController(url: url)
        print("visited url: \(url)")

        if action == .Advance {
            pushViewController(visitable, animated: true)
        } else if action == .Replace {
            popViewController(animated: false)
            pushViewController(visitable, animated: false)
        }

        session.visit(visitable)
    }

    fileprivate func presentAuthenticationController() {
        let authenticationController = AuthenticationController()
        authenticationController.delegate = self
        authenticationController.webViewConfiguration = webViewConfiguration
        authenticationController.url = url.appendingPathComponent("account/sign_in")
        authenticationController.title = "Sign in"

        let authNavigationController = UINavigationController(rootViewController: authenticationController)
        present(authNavigationController, animated: true, completion: nil)
    }
}

extension ApplicationController: SessionDelegate {
    func session(_ session: Session, didProposeVisitToURL URL: Foundation.URL, withAction action: Action) {
        presentVisitableForSession(session, url: URL, action: action)
    }

    func session(_ session: Session, didFailRequestForVisitable visitable: Visitable, withError error: NSError) {
        NSLog("ERROR: %@", error)
        guard let myViewController = visitable as? MyViewController, let errorCode = ErrorCode(rawValue: error.code) else { return }

        switch errorCode {
        case .httpFailure:
            let statusCode = error.userInfo["statusCode"] as! Int
            switch statusCode {
            case 401:
                presentAuthenticationController()
            case 404:
                myViewController.presentError(.HTTPNotFoundError)
            default:
                myViewController.presentError(Error(HTTPStatusCode: statusCode))
            }
        case .networkFailure:
            myViewController.presentError(.NetworkError)
        }
    }

    func sessionDidStartRequest(_ session: Session) {
        application.isNetworkActivityIndicatorVisible = true
    }

    func sessionDidFinishRequest(_ session: Session) {
        application.isNetworkActivityIndicatorVisible = false
    }
}

extension ApplicationController: AuthenticationControllerDelegate {
    func authenticationControllerDidAuthenticate(_ authenticationController: AuthenticationController) {
        session.reload()
        dismiss(animated: true, completion: nil)
    }
}

Что мне не хватает? Спасибо.