Solved by me:
final SSLSocketFactory sslFactory = getSSLSocketFactory();
final Socket socket = sslFactory.createSocket(IP, PORT);
final int contentLenght = request.renderSafe().
final PrintWriter pw = new PrintWriter(socket.getOutputStream());
pw.println(FIRST_HTTP_HEADER);
pw.println(HOST);
pw.println(CONTENT_TYPE);
pw.println(CONTENT_LENGTH + ":" + contentLenght);
pw.println("");
pw.println(request);
pw.flush();
Only this solution worked for me.