javascript - Node.js Socket.io 错误 : disconnect event is triggered after connect

Question

• 在服务器上，断开连接事件在网络连接后触发 掉线，客户端重新连接。

客户端代码:

var url ='192.168.1.101', port = '80',
    socket = io.connect('http://' + url + ':' + port, {
    'reconnect': true,
    reconnection: true,
    reconnectionDelay: 1000,
    reconnectionDelayMax: 5000,
    timeout: 1000
});

//重连事件

socket.on('reconnect', function (nr) {
    console.log('reconnected, nr: ', nr);
});

//连接事件

socket.on('connect', function () {
    console.log('connected');
});

//断开事件

socket.on('disconnect', function () {
    console.log('disconnected');
});

服务器代码:

'use strict';
var fs = require('fs'),
    express = require('express'),
    app = express(),
    io = require('socket.io'),
    server = require('http').createServer(app),
    compress = require('compression'),
    socket;

app.use(compress({level: 9}));

server.listen(port, url);
socket = io.listen(server, {'pingTimeout': 1000, 'pingInterval': 3000});

socket.on('connection', function (client) {
    console.log('client connected');

    client.on('disconnect', function () {
        console.log('client disconnected');
    });
});

        
- Result on server if client reconnects:

> client connected
> client disconnected

Can someone explain to me why this is happening?

Answer 1

客户端和服务器在连接处于事件状态时交换心跳消息。当服务器停止接收这些消息时，它将声明客户端已断开连接。客户端也可以显式断开连接。

您遇到的可能是第一种情况。客户端有一个重试逻辑，所以只要连接断开，它就会尝试重新连接。我不确定为什么会发生这种情况，您可能想查看浏览器控制台中的网络选项卡，了解在请求/响应级别发生了什么。

引用: https://github.com/socketio/socket.io/issues/1910

https://github.com/miguelgrinberg/Flask-SocketIO/issues/116