docs: def POST(self, func, data):
          """Send POST request to execute Ndrive API
  
          :param func: The function name you want to execute in Ndrive API.
          :param params: Parameter data for HTTP request.
  
          :returns: ``metadata`` when success or ``False`` when failed
          """
          s, message = self.checkAccount()
          if s is False:
              return False, message
  
          url = nurls[func]
          r = self.session.post(url, data = data)
          r.encoding = 'utf-8'
  
          if self.debug:
              print r.text.encode("utf-8")
  
          try:
              metadata = json.loads(r.text)
              message = metadata['message']
              if message == 'success':
                  try:
                      return True, metadata['resultvalue']
                  except:
                      return True, metadata['resultcode']
              else:
                  return False, "Error %s: %s" %(func, message)
          except:
              #for e in sys.exc_info():
              #    print e
              #sys.exit(1)
              return False, "Error %s: Failed to send POST request" %func