fix_image_orientation.dart

  Future<void> loadImage() async {
    final response = await http.get(widget.url);

    if (response.statusCode == 200) {
      imageBytes = response.bodyBytes;
      imageRotate = await getRotateFromImageBytes(imageBytes);

      setState(() {});
    }
  }

  Future<int> getRotateFromImageBytes(List<int> bytes) async {
    int rotate = 0;

    if (kIsWeb) {
      final Map<String, IfdTag> exifData = await readExifFromBytes(bytes);
      if (exifData != null &&
          exifData.isNotEmpty &&
          exifData.containsKey('Image Orientation')) {
        final IfdTag orientation = exifData['Image Orientation'];
        final int orientationValue = orientation.values[0];

        if (orientationValue == 3) {
          rotate = 180;
        }

        if (orientationValue == 6) {
          rotate = -90;
        }

        if (orientationValue == 8) {
          rotate = 90;
        }
      }
    }

    return rotate;
  }