MAUI HybridWebView working with a self signed cert for testing

You need to define your configuration better. Are you using a real device or simulator for debug? Which o/s is hosting the device or simulator? Is the webserver the same as the simulator host? What is the certificate cname? Does the device or simulator dns server resolve the certificate cname? Are you debugging an Android or iOS app?

Hello @Jerry Bonetti ,

Thanks for your question.

Because your purpose is testing, I recommend these following steps:

Wrap everything in #if DEBUG so you never ship insecure code to production.

Step 1: Create a Custom WebViewClient (just for Android)

Create a new file called CustomWebViewClient.cs (anywhere in your project):

#if ANDROID
using Android.Webkit;

public class CustomWebViewClient : WebViewClient
{
    public override void OnReceivedSslError(global::Android.Webkit.WebView view, SslErrorHandler handler, SslError error)
    {
        Debug.WriteLine("=== SSL Error bypassed for testing ===");
        handler.Proceed();
    }
}
#endif

Step 2: Open MauiProgram.cs and add this right after builder.Services... (inside the CreateMauiApp method):

#if ANDROID
Microsoft.Maui.Handlers.WebViewHandler.Mapper.AppendToMapping("MyInsecureCustomization", (handler, view) =>
{
    if (view is HybridWebView)
    {
        handler.PlatformView.SetWebViewClient(new CustomWebViewClient());
    }
});
#endif

Step 3: For iOS, add this to your Platforms/iOS/Info.plist (inside the <dict> section):

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

Step 4: Test it

1. Clean and rebuild your solution
2. Set your HybridWebView source like this:

hybridWebView.Source = new UrlWebViewSource
{
    Url = "https://10.0.2.2:5001/index.html"   // ← change port as needed
};

3. Run on Android Emulator. Check the Output window (Debug tab) — you should see the message "=== SSL Error bypassed for testing ===" if the override worked.

Note: make sure your local web server is running and reachable from the emulator.

I hope this addresses your question. If this response was helpful, please consider following the guidance to provide feedback.