code: def verify_callback(
              self,
              origin_authorization,
              url,
              body,
              content_type='application/x-www-form-urlencoded'):
          
          token = self.token_of_request(url, body, content_type)
          authorization = 'QBox {0}'.format(token)
          return origin_authorization == authorization
docs: 回调验证
  
          Args:
              origin_authorization: 回调时请求Header中的Authorization字段
              url:                  回调请求的url
              body:                 回调请求的body
              content_type:         回调请求body的Content-Type
  
          Returns:
              返回true表示验证成功，返回false表示验证失败