[webview_flutter] Ignore SSL certificate errors

packages/webview_flutter/android/src/main/java/io/flutter/plugins/webviewflutter/FlutterWebViewClient.java

@@ -111,6 +111,12 @@ public void onPageFinished(WebView view, String url) {
         FlutterWebViewClient.this.onPageFinished(view, url);
       }
 
+      @Override
+      public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError er) {
+        // Ignore SSL certificate errors
+        handler.proceed();
+      }
+
       @Override
       public void onUnhandledKeyEvent(WebView view, KeyEvent event) {
         // Deliberately empty. Occasionally the webview will mark events as having failed to be