code: def send_message(self, recipient_list, subject, body):
          
          url = 'http://www.shanbay.com/api/v1/message/'
          recipient = ','.join(recipient_list)
          data = {
              'recipient': recipient,
              'subject': subject,
              'body': body,
              'csrfmiddlewaretoken': self._request.cookies.get('csrftoken')
          }
          response = self.request(url, 'post', data=data)
          return response.ok
docs: 发送站内消息
  
          :param recipient_list: 收件人列表
          :param subject: 标题
          :param body: 内容（不能超过 1024 个字符）