mediaFailureCause function

String? mediaFailureCause(String url, Object error)

The health cause for a media error, or null for network and 5xx noise.

Implementation

String? mediaFailureCause(String url, Object error) {
  final trimmed = url.trim();
  if (trimmed.isEmpty ||
      trimmed.contains('{{') ||
      Uri.tryParse(trimmed)?.hasScheme != true) {
    return 'invalid_url';
  }
  if (error is FormatException) return 'decode';
  // These media libraries expose no typed HTTP status here.
  final message = '$error';
  if (RegExp(r'(statusCode: |status |Response code: )4\d\d')
      .hasMatch(message)) {
    return 'http_4xx';
  }
  if (message.contains('Invalid image data')) return 'decode';
  return null;
}