401错误

401一般是未登录，需要进行认证  

//401 设置用户名和密码 认证

    NSString * user = [userDefaults objectForKey:@"employeeNumber"];
    
    NSString * password = [userDefaults objectForKey:@"password"];
    

    [manager.requestSerializer setAuthorizationHeaderFieldWithUsername:user password:password];

对应还有取消认证

 [manager.requestSerializer clearAuthorizationHeader];