             let script = """
                 var script = document.createElement('meta');
                 script.name = 'viewport';
-                script.content=\"width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no\";
+                script.content= 'width=device-width, initial-scale=1.0, user-scalable=no';
                 document.getElementsByTagName('head')[0].appendChild(script);
             """
             let scaleScript = WKUserScript(source: script, injectionTime: .atDocumentEnd, forMainFrameOnly: false)

    }
    
    fileprivate func launchExternalApp(url: URL) {
        let alertController = UIAlertController(title: "Leave current app?", message: "This web page is trying to open an outside app. Are you sure you want to open it?", preferredStyle: .alert)
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        alertController.addAction(cancelAction)
        let openAction = UIAlertAction(title: "Open App", style: .default) { (action) in
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(url)
            } else {
                UIApplication.shared.openURL(url)
            }
        }
        alertController.addAction(openAction)
        UIApplication.shared.keyWindow?.rootViewController?.present(alertController, animated: true)
    }
}


    
    public var customHTTPHeaderFields: [String : String]?
    
    private var _validSchemes = Set<String>(["http", "https", "file"])
    
    private var progressContext = 0
    private var pageTitleContext = 0
