con = (HttpURLConnection) target.openConnection();
con.setDoOutput(true); // request POST
con.setRequestMethod("POST");
con.setChunkedStreamingMode(0);
con.setRequestProperty("Content-type","application/octet-stream");
con.addRequestProperty("Session", uuid.toString());
con.addRequestProperty("Side","upload");
if (authorization != null) {
con.addRequestProperty ("Authorization", authorization);
}