I have handled the network image issue related to 404 by using an errorBuilder.

Image.network('Your image url...', errorBuilder: (BuildContext context, Object exception, StackTrace stackTrace) { return Text('Your error widget...'); }, ),

I have handled the network image issue related to 404 by using an errorBuilder.
Image.network('Your image url...', errorBuilder: (BuildContext context, Object exception, StackTrace stackTrace) { return Text('Your error widget...'); }, ),

[errorBuilder property][1]

[1]: https://api.flutter.dev/flutter/widgets/Image/errorBuilder.html