Fix: connection retry fails for multipart upload

                connection.setFixedLengthStreamingMode(contentLength);

                out = new BufferedOutputStream(connection.getOutputStream());

                byte[] bytes = data;

                if (isMultipart) {

                    out.write(data);

                    out.write(bytes);

                    writeMultipartFile(out, uri);

                    out.write(delimiter, 0, delimiter.length - 2);

                    String end = DASH + CRLF;

                    data = end.getBytes(StandardCharsets.UTF_8);

                    bytes = end.getBytes(StandardCharsets.UTF_8);

                }

                out.write(data);

                out.write(bytes);

                out.flush();

                int responseCode = connection.getResponseCode();