Загрузка изображения на сервер в Multipart вместе с данными JSON в Android

Я пытаюсь загрузить изображение на сервер вместе с некоторыми данными JSON, собранными из формы.

Сервер имеет аутентификацию.

METHOD: post

HEADERS:

Authorization   Basic d2Vic2VydmljZTpyM05hdTE3Rw==

Content-Type    multipart/form-data;boundary=xxxxxxxx

BODY:

--xxxxxxxx

Content-Disposition: form-data; name="jsonFile"
Content-Type: application/json

{"model":"Premium","deviceLongitude":4.79337638,"pseudo":"nickname","deviceLatitude":45.7671507,"year":"2005","email":"email@mail.com","deviceLocale":"fr_FR","title":"my picture"}

--xxxxxxxx

Content-Disposition: form-data; name="imgName"
Content-Type: image/jpeg

//Image data array

/9j/4AAQSkZJRgABAQAAAQABAAD/4QBYRXhpZgAATU0AKgAAAAgAAgESAAMAAAAB
AAEAAIdpAAQAAAABAAAAJgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAAB4KAD
AAQAAAABAAACgAAAAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB
AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEB
AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB
AQEBAQEBAQH/wAARCAKAAeADAREAAhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAA
AAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQAAAF
--xxxxxxxx