@csrf_exempt
def add_bookshelf(request):
  user_id = request.POST.get('user_id')
  print(user_id)
  return HttpResponse('123')

corsheaders.middleware.CorsPostCsrfMiddleware

'corsheaders.middleware.CorsMiddleware',
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'corsheaders.middleware.CorsPostCsrfMiddleware',

class CorsPostCsrfMiddleware(MiddlewareMixin):

  def _https_referer_replace_reverse(self, request):
    """
    Put the HTTP_REFERER back to its original value and delete the
    temporary storage
    """
    if conf.CORS_REPLACE_HTTPS_REFERER and 'ORIGINAL_HTTP_REFERER' in request.META:
      http_referer = request.META['ORIGINAL_HTTP_REFERER']
      request.META['HTTP_REFERER'] = http_referer
      del request.META['ORIGINAL_HTTP_REFERER']

  def process_request(self, request):
    self._https_referer_replace_reverse(request)
    return None

  def process_view(self, request, callback, callback_args, callback_kwargs):
    self._https_referer_replace_reverse(request)
    return None