websockets & auto close & bug & solution
WS 连接总是被关闭 ???
refs
https://wdd.js.org/websocket-close-reasons.html
https://segmentfault.com/a/1190000014582485
https://zhuanlan.zhihu.com/p/25592934
https://blog.csdn.net/jintingbo/article/details/80864030
https://github.com/Pines-Cheng/blog/issues/37
https://www.cnblogs.com/1wen/p/9789260.html
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