question

Hello,​

Is there a way to get further information about the cause of the failure? Like a network access error, DNS error, a timeout, etc.?

You can create a custom renderer for your WebView.
For Android, you can achieve WebViewClient class, get the further information about the cause of the failure from OnReceivedHttpError method.

public class CustomWebViewRenderer: WebViewRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
        {
            base.OnElementChanged(e);

            Control.SetWebViewClient(new MyWebViewClient());
        }
    }

    public class MyWebViewClient : Android.Webkit.WebViewClient
    {
        public override void OnReceivedHttpError(Android.Webkit.WebView view, Android.Webkit.IWebResourceRequest request, Android.Webkit.WebResourceResponse errorResponse)
        {
//get error from errorResponse
            base.OnReceivedHttpError(view, request, errorResponse);
        } 
    }

For iOS, you can achieve WKNavigationDelegate in webview's custom renderer and get error from DidFailProvisionalNavigation method.

public class CustomWebViewRenderer : WkWebViewRenderer
    {
       
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);
           
            if (e.OldElement == null)
            {
                NavigationDelegate = new CustomWebViewDelegate();
            }
        }

    internal class CustomWebViewDelegate : WKNavigationDelegate { 
        public override void DidFailProvisionalNavigation(WKWebView webView, WKNavigation navigation, NSError error)
        {
       
            switch (error.Code)
            {
                case -1009: // no internet access
                    {
                     
                        break;
                    }
                case -1001: // timeout
                    {
                      
                        break;
                    }
                case -1003: // server cannot be found
                case -1100: // url not found on server
                default:
                    {
                        
                        break;
                    }
            }

        }
    }

Best Regards,

Leon Lu

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