WebSocket

https://blog.csdn.net/sbsujjbcy/article/details/52839540 (亲测可用)

• WebSocket 教程 - 阮一峰的网络日志
  http://www.ruanyifeng.com/blog/2017/05/websocket.html
• Android最佳实践——深入浅出WebSocket协议 - CSDN博客
  https://blog.csdn.net/sbsujjbcy/article/details/52839540
• Android WebSocket连接不成功 - CSDN博客
  https://blog.csdn.net/xgangzai/article/details/72675080?locationNum=1&fps=1