在cPanel部署Socket.IO Node.js应用时出现GET 404错误求助

问题现象 #

在cPanel主机部署Node.js应用后，页面可正常打开，但Node.js无法向客户端发送数据，浏览器控制台出现如下错误：

GET http://streamedbot.xyz/socket.io/?EIO=3&transport=polling&t=OFQdTfs 404 (Not Found)

应用代码（app.js） #

const fetchP2PData = require("./fetchP2PData.js");
const app = require("express")();
const path = require("path");
const Datastore = require("nedb");
const { createServer } = require('http')
const { Server } = require('socket.io')

const server = createServer(app)
const io = new Server(server, {
 cors: { 
    origin: "*",
methods: ["GET", "POST"],
credentials: false,
transports: ['websocket', 'polling'],
},
allowEIO3: true
})

app.get('/bkpapp/', function(req,res){
    res.sendFile(__dirname + '/index.html');
});
let prices = [];
let openingPrice = 0 ;
const priceDb = new Datastore("./price.db");
 priceDb.loadDatabase();

 priceDb.find({}, { time: 1, value: 1, _id: 0 }, function (err, docs) {
  docs.reverse();
  prices = docs;
  console.log(prices);
});

setInterval(function () {
  (async function () {
    
let totalPrices = []; 

    const firstPage = await fetchP2PData(1, "ETB", "BUY", "USDT", null);

    if (firstPage && firstPage.success) {
      const totalPages = Math.ceil(firstPage.total / 20);
      const pagesToRun = new Array(totalPages - 1).fill(null);
      const totalElements = await pagesToRun.reduce(async (prev, _, idx) => {
        const accData = await prev;
        const page = idx + 2;

        const pageResult = await fetchP2PData(page, "ETB", "BUY", "USDT", null);
        if (pageResult && pageResult.success) {
          return [...accData, ...pageResult.data];
        }
        return accData;
      }, Promise.resolve(firstPage.data));
      totalElements.map((obj) => {
        totalPrices.push(parseFloat(obj.adv.price));
      });
    }

    
    let currentPrice = ((totalPrices[0]+totalPrices[1]+totalPrices[2]+totalPrices[3]+totalPrices[4]+totalPrices[5]+totalPrices[6]+totalPrices[7]+totalPrices[8]+totalPrices[9]+totalPrices[10])/11)-3.95;
    const d = new Date();
    if(d.getHours() == 00 && d.getMinutes() == 00){
      openingPrice = currentPrice;
     }

    let dailyPercentage = ((currentPrice - openingPrice)/openingPrice)*(100)
    prices.push({ time: d.getTime()/1000, value: (((totalPrices[0]+totalPrices[1]+totalPrices[2]+totalPrices[3]+totalPrices[4]+totalPrices[5]+totalPrices[6]+totalPrices[7]+totalPrices[8]+totalPrices[9]+totalPrices[10])/11)-3.95)})
   
    io.on('connection', sock => {
        
      })

      if(totalPrices != null){
       io.sockets.emit('price', prices)
       priceDb.insert({ time: d.getTime()/1000, value: (((totalPrices[0]+totalPrices[1]+totalPrices[2]+totalPrices[3]+totalPrices[4]+totalPrices[5]+totalPrices[6]+totalPrices[7]+totalPrices[8]+totalPrices[9]+totalPrices[10])/11)-3.95)});
       io.sockets.emit('dailyPercentage', dailyPercentage)
      }
      
    console.log(prices);
  })();
}, 10000);

server.listen(3000, function(){
    console.log('listening to 80')
})

解决步骤 #

1. 修正Socket.IO路径匹配cPanel应用路由 #

cPanel部署Node.js应用时，会通过反向代理将/bkpapp/路径映射到本地3000端口。Socket.IO默认使用根路径/socket.io/，导致和cPanel的代理路径不匹配，触发404错误。

• 服务端修改：给Socket.IO添加path配置，匹配应用路径：

  const io = new Server(server, {
    cors: { 
      origin: "*",
      methods: ["GET", "POST"],
      credentials: false,
      transports: ['websocket', 'polling'],
    },
    allowEIO3: true,
    path: '/bkpapp/socket.io/' // 新增该行，与应用路由对齐
  })
  

• 客户端修改（index.html中的Socket.IO连接代码）：指定连接路径为/bkpapp/：

  const socket = io('/bkpapp/', {
    transports: ['websocket', 'polling'],
    allowEIO3: true
  });
  

2. 移除重复绑定的connection事件 #

代码在setInterval定时器内重复执行io.on('connection', ...)，每次定时器触发都会新增一个连接监听，会造成资源泄漏且影响连接逻辑。将这段代码移到定时器外部，只绑定一次：

// 移到setInterval外面，仅初始化时绑定一次
io.on('connection', sock => {
  console.log('客户端已连接');
  // 可选：给新连接发送初始数据
  sock.emit('price', prices);
  sock.emit('dailyPercentage', openingPrice ? ((prices[prices.length-1].value - openingPrice)/openingPrice)*100 : 0);
})

setInterval(function () {
  // ... 原有定时器代码，删除里面的io.on('connection')块
}, 10000);

3. 修正服务器监听日志 #

代码中监听3000端口，但日志输出listening to 80，容易造成混淆，修正为实际监听端口：

server.listen(3000, function(){
  console.log('listening on port 3000')
})

4. 检查cPanel应用配置 #

• 确认cPanel中Node.js应用的根目录指向包含app.js的文件夹
• 验证启动命令为node app.js
• 确认应用的挂载路径设置为/bkpapp/，反向代理正确映射到3000端口

内容的提问来源于stack exchange，提问作者zemen aferash