The Express4.x version uses socket.io

how to use socket.io in express4.x version routing? I"ve been looking for the answer for a long time. The Internet is full of express3.x version

Express socket.io

Feb.27,2021

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Socket.io connection failed, error server error
app.js var app = require( express )(); websocket ExpressAPPHTTP var http = require( http ).Server(app); socket.io var io=require( socket.io )(http); var users=[] connection connection io.on("connection",function(soc...

Vue.js express socket.io

Mar.12,2021

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b308b7-40d64.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b308b7-40d64.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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