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类似ＱＱ和微信等即使工具，他们实现实时聊天用到什么技术，具体什么协议，什么开源库等,android和ios的都可以说说知道的。
Tt on Mogujie, which is very popular recently, can meet your needs to a certain extent
They probably use their own protocol, but generally you can just use xmpp, although it consumes more traffic.You can refer to: http://www.zhihu.com/question/20730361
Actually, I want to know how Didi does it
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Tt on Mogujie, which is very popular recently, can meet your needs to a certain extent
They probably use their own protocol, but generally you can just use xmpp, although it consumes more traffic.
You can refer to: http://www.zhihu.com/question/20730361
Actually, I want to know how Didi does it