Ephmeral session or how to clear logged in state in WKWebView after logout?

首先复现 issue 中描述的 login、logout 以及第二次 WKWebView login 流程。跟踪 Google SignIn signOut() 以及 WKWebView、HTTPCookieStorage 和 WKWebsiteDataStore 的处理。完成的标准是：logout 后重新打开的 WKWebView 不再显示之前缓存的 Google 账户。

Describe the bug
I'm wondering how to enable ephemeral session using Google SignIn?
Or how to correctly clear cookies in WKWebView after Google SignIn signOut() method?

To Reproduce
Steps to reproduce the behavior:

1. Login using Google SignIn
2. Opens WKWebView with no google account signed in (email field is cleared)
3. After entering credentials and successful login try to logout
4. Login again
5. Opens WKWebView with cached google account

Expected behavior
(5) Opens WKWebView with no google account signed in (email field is cleared)

Screenshots
none

Environment

• Device: iPhone Simulator
• OS: iOS 16.2
• Browser: Safari

Additional context
I tried to clear cookies

1. In iOS Settings-Safari-Clear History and Website Data

2. Programmatically:

func clearAllCookies() {

         let url = URL(string: "https://accounts.google.com/Logout")!
         UIApplication.shared.open(url, options: [:], completion: nil)

        if let cookies = HTTPCookieStorage.shared.cookies, cookies.count > 0 {
            HTTPCookieStorage.shared.removeCookies(since: .distantPast)
            print("All cookies deleted")
        }
        
        let dataStore = WKWebsiteDataStore.default()
        dataStore.fetchDataRecords(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes()) { records in
            records.forEach { record in
                dataStore.removeData(ofTypes: record.dataTypes, for: [record], completionHandler: {
                    print("Deleted:", record)
                })
            }
        }
    }

None of the above worked.