云对象的如何统一处理token呢？

想在_before中统一检测token，然后返回401状态码，但是好像_before中的return不生效，大家是怎么处理的呢？

  _before() {  
    const httpInfo = this.getHttpInfo();  
    const methodName = this.getMethodName();  

    const whiteList = ['login', 'add'];  
    if (!whiteList.includes(methodName) && !httpInfo.headers.token) {  
      return {  
        mpserverlessComposedResponse: true,  
        statusCode: 401,  
      };  
    }  
  },