Cookie

 public func webView(webView: WKWebView, decidePolicyForNavigationResponse navigationResponse: WKNavigationResponse, decisionHandler: (WKNavigationResponsePolicy) -> Void) {
        if let url = webView.URL, let absoluteString = url.absoluteString {
            if absoluteString.containsString(cookie_URL){
                if let response = navigationResponse.response as? NSHTTPURLResponse {
                    let cookies = NSHTTPCookie.cookiesWithResponseHeaderFields(response.allHeaderFields as! [String: String], forURL: url)
                    if cookies.count > 0 {
                        let data = NSKeyedArchiver.archivedDataWithRootObject(cookies)
                        NSUserDefaults.standardUserDefaults().setValue(data, forKey: "COOKIES")
                        NSUserDefaults.standardUserDefaults().synchronize()
                    }
                }
            }
        }
        decisionHandler(.Allow)
    }