Dio - Flutter Image Upload returning Socket Exception - sockets

Question

I have tried uploading image using formData which Dio plugin supports.
FormData formData = new FormData.from(
{"profile_image": UploadFileInfo(image, "profile_image.jpg")});
var response = await _dio.post(ApiConfiguration.getUploadImageUrl().toString(),data: formData);
But its returning error.
DioError [DioErrorType.DEFAULT]: SocketException: OS Error: Connection reset by peer, errno = 54, address = 3.122.199.93, port = 62181
Any help would be appreciated.

Answer 1

UploadFileInfo and FormData.from deprecated in v3. Documentation needs to be clearer and updated. I wasted a good part of a day with this.
I used dio for post a file path with some other information in this way :
Dio dio = new Dio();
FormData formData = new FormData();
formData.add(
"apiKey",
"my_api_key",
);
formData.add(
"file",
"image_path",
);
Response response = await dio.post(
"https://localhost",
data: formData,
onSendProgress: (int sent, int total) {
// do something
},
).catchError((onError) {
throw Exception('something');
});

Answer 2

Faced something similar in Release version of the app, Dio was failing to upload images. This could be due to two reasons, one is mentioned above that you are using a deprecated methods in v3 or You can try adding this permission to the Manifest
Add this permission
<uses-permission android:name="android.permission.INTERNET" />
to your app level Manifest.
android/app/src/main/AndroidManifest.xml
Solution can be found here
https://stackoverflow.com/a/59392036/14641365
Although the other work around to upload an image to the server that I used is something as follows
String url = "YOUR_URL_TO_UPLOAD";
FormData formData = FormData.fromMap({
"QUERY_PARAM_NAME": await MultipartFile.fromFile("IMAGE_PATH", filename:"TESTING.jpg"),
});
var response = await dio.post(url, data: formData);