@RequestMapping(value = "/playAudio/{id}")
  public void playAudio(HttpServletResponse response, @PathVariable(value = "id") int id) {
    log.debug("in audio streaming, id = {}", id);
    WallPost post = postService.getPost(id);
    OutputStream output = null;

    try {
      output = response.getOutputStream();
      response.setContentType(post.getAudioContentType());
      output.write(post.getAudioContent());
      output.flush();
    } catch (IOException e) {
      e.printStackTrace();

    } finally {
      try {
        output.close();
      } catch (IOException e) {

      }
    }
  }