Keep getting and posting /socket.io/?EIO=3&transport=polling&t= #3615

chengtie · 2020-06-25T18:07:15Z

My backend in ExpressJS and NodeJS used to work well. I just realized that logs exploded the disk (the backend is still functional), because when the backend is on, it keeps trying:

kpi.js GET /socket.io/?EIO=3&transport=polling&t=NBiaEK6
index.js GET /socket.io/?EIO=3&transport=polling&t=NBiaEK6
index.js router.get *
kpi.js POST /socket.io/?EIO=3&transport=polling&t=NBiaER6
index.js POST /socket.io/?EIO=3&transport=polling&t=NBiaER6
Error: Not Found
    at /opt/funfun/app.js:99:13
    at Layer.handle [as handle_request] (/opt/funfun/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/opt/funfun/node_modules/express/lib/router/index.js:317:13)
    at /opt/funfun/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/opt/funfun/node_modules/express/lib/router/index.js:335:12)
    at next (/opt/funfun/node_modules/express/lib/router/index.js:275:10)
    at /opt/funfun/node_modules/express/lib/router/index.js:635:15
    at next (/opt/funfun/node_modules/express/lib/router/index.js:260:14)
    at /opt/funfun/routes/index.js:18:2
    at Layer.handle [as handle_request] (/opt/funfun/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/opt/funfun/node_modules/express/lib/router/index.js:317:13)
    at /opt/funfun/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/opt/funfun/node_modules/express/lib/router/index.js:335:12)
    at next (/opt/funfun/node_modules/express/lib/router/index.js:275:10)
    at Function.handle (/opt/funfun/node_modules/express/lib/router/index.js:174:3)
    at router (/opt/funfun/node_modules/express/lib/router/index.js:47:12)
    at Layer.handle [as handle_request] (/opt/funfun/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/opt/funfun/node_modules/express/lib/router/index.js:317:13)
    at /opt/funfun/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/opt/funfun/node_modules/express/lib/router/index.js:335:12)
    at next (/opt/funfun/node_modules/express/lib/router/index.js:275:10)
    at /opt/funfun/node_modules/express/lib/router/index.js:635:15
kpi.js GET /socket.io/?EIO=3&transport=polling&t=NBiaF8A
index.js GET /socket.io/?EIO=3&transport=polling&t=NBiaF8A
index.js router.get *
kpi.js POST /socket.io/?EIO=3&transport=polling&t=NBiaFFz
index.js POST /socket.io/?EIO=3&transport=polling&t=NBiaFFz
Error: Not Found
    at /opt/funfun/app.js:99:13
    at Layer.handle [as handle_request] (/opt/funfun/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/opt/funfun/node_modules/express/lib/router/index.js:317:13)
    at /opt/funfun/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/opt/funfun/node_modules/express/lib/router/index.js:335:12)
    at next (/opt/funfun/node_modules/express/lib/router/index.js:275:10)
    at /opt/funfun/node_modules/express/lib/router/index.js:635:15
    at next (/opt/funfun/node_modules/express/lib/router/index.js:260:14)
    at /opt/funfun/routes/index.js:18:2
    at Layer.handle [as handle_request] (/opt/funfun/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/opt/funfun/node_modules/express/lib/router/index.js:317:13)
    at /opt/funfun/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/opt/funfun/node_modules/express/lib/router/index.js:335:12)
    at next (/opt/funfun/node_modules/express/lib/router/index.js:275:10)
    at Function.handle (/opt/funfun/node_modules/express/lib/router/index.js:174:3)
    at router (/opt/funfun/node_modules/express/lib/router/index.js:47:12)
    at Layer.handle [as handle_request] (/opt/funfun/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/opt/funfun/node_modules/express/lib/router/index.js:317:13)
    at /opt/funfun/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/opt/funfun/node_modules/express/lib/router/index.js:335:12)
    at next (/opt/funfun/node_modules/express/lib/router/index.js:275:10)
    at /opt/funfun/node_modules/express/lib/router/index.js:635:15

kpi.js GET ... and index.js GET ... are what I print. Here is the code of opt/funfun/app.js:

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  var err = new Error('Not Found');  // line 99
  err.status = 404;
  next(err);
});

Does anyone know what may be the reason?

The text was updated successfully, but these errors were encountered:

SibiAkkash · 2020-07-10T09:13:18Z

I am getting the same error too

hmagrahi · 2020-07-14T14:51:21Z

Same error

ven · 2020-07-14T16:27:51Z

Are you accessing this through a reverse proxy? Creating a rewrite rule fixed this for me.

kfirprods · 2020-07-18T15:20:24Z

Are you accessing this through a reverse proxy? Creating a rewrite rule fixed this for me.

I am getting this error using a reverse proxy. Would you please share with us the rewrite rule that fixed it?

saurav111 · 2020-07-26T04:02:29Z

Same, please do share

ven · 2020-07-26T12:39:30Z

Hi,

Try this:

server {
    listen 80;
    server_name YOURDOMAIN.COM;
    client_max_body_size 100M;
    location /socket.io/ {
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
        proxy_pass http://localhost:PORTNUMBER/socket.io/;
    }
}

AvalancheAccessories · 2021-12-21T01:45:28Z

Hi,

Try this:

server {
    listen 80;
    server_name YOURDOMAIN.COM;
    client_max_body_size 100M;
    location /socket.io/ {
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
        proxy_pass http://localhost:PORTNUMBER/socket.io/;
    }
}

Where would i put this code?

darrachequesne · 2021-12-21T09:39:42Z

@AvalancheAccessories this is the configuration for NginX, used as a reverse proxy in front of your Socket.IO server(s)

Reference: https://socket.io/docs/v4/reverse-proxy/#nginx

Regarding the initial issue, the multiple requests might be due to a v2 client which tries to connect.

For v3 and above, you need to enable backward compatible mode on the server side:

import { Server } from "socket.io";

const io = new Server({
  allowEIO3: true
});

Reference: https://socket.io/docs/v4/server-options/#alloweio3

You can check those specific errors by listening to the connection_error event:

io.engine.on("connection_error", (err) => {
  if (err.code === 5) {
    // Unsupported protocol version
  }
});

Reference: https://socket.io/docs/v4/server-api/#event-connection_error

sampete1997 · 2023-08-19T10:20:07Z

hi,
I have node js server with express and react js client in local. in local socket io is working fine but when i deployed to aws ec2 instance I am getting 404 status error

server

import express, { Express, Response, Request, NextFunction } from "express";
import bodyParser from "body-parser";
import cors from "cors";
import ErrorHandler from "./utils/errorHandler";
import MongoService, { Collections } from "./utils/mongo";
import http from 'http'
import socketIO from "socket.io";

const app: Express = express();
const PORT = process.env.PORT;

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json({ limit: "1mb" }));
app.use(cors());
const server = http.createServer(app);

export const io = new socketIO.Server(server, {
  cors: {
    origin: "*",  
    methods: ["GET", "POST"],
  },
});

io.on("connection", (socket) => {
    console.log(
      "connection successful! \n user connected ID: ",
      socket.id,
      "\n"
    );
    
    socket.on("disconnect", () => {
      console.log("Disconnected", "\n user ID: ", socket.id, "\n");
    });
  });
export const IO = io;

MongoService.init().then(() => {
  server.listen(PORT, async () => {
    await seed();
    console.log(`Server running at ${PORT}`);
  });
});

client

import io from 'socket.io-client';
// export const BACKEND_URL = 'http://localhost:3001';
export const BACKEND_URL = 'https://mywsbackend.tech';
export const socket = io(BACKEND_URL,{withCredentials: false, rejectUnauthorized: false}); //connecting to socket server
socket.on("connect_error", (err) => {
  console.log(`connect_error due to ${err.message}`);
});

aws ec2 logs

0|index  | GET /socket.io/?EIO=4&transport=polling&t=OeD8PKY 404 149 - 0.493 ms
0|index  | GET /socket.io/?EIO=4&transport=polling&t=OeD8PL1 404 149 - 0.417 ms
0|index  | GET /socket.io/?EIO=4&transport=polling&t=OeD8Pjr 404 149 - 0.447 ms
0|index  | GET /socket.io/?EIO=4&transport=polling&t=OeD8Qme 404 149 - 0.459 ms
0|index  | GET /socket.io/?EIO=4&transport=polling&t=OeD8RBb 404 149 - 0.451 ms
0|index  | GET / 200 24 - 0.487 ms
0|index  | GET /socket.io/?EIO=4&transport=polling&t=OeD8SEW 404 149 - 0.438 ms
0|index  | GET /socket.io/?EIO=4&transport=polling&t=OeD8SF0 404 149 - 0.417 ms

REQUEST HEADER

Request URL:
https://mywsbackend.tech/socket.io/?EIO=4&transport=polling&t=OeD7QRi
Request Method:
GET
Status Code:
404
Remote Address:
#########
Referrer Policy:
strict-origin-when-cross-origin

:Authority:
mywsbackend.tech
:Method:
GET
:Path:
/socket.io/?EIO=4&transport=polling&t=OeD7QRi
:Scheme:
https
Accept:
*/*
Accept-Encoding:
gzip, deflate, br
Accept-Language:
en-US,en;q=0.9
Origin:
http://localhost:3000
Referer:
http://localhost:3000/
Sec-Fetch-Dest:
empty
Sec-Fetch-Mode:
cors
Sec-Fetch-Site:
cross-site

everything is working fine in local getting issue in aws server only please help to fix this!

darrachequesne closed this as completed Dec 21, 2021

This was referenced Oct 30, 2022

[Snyk] Security upgrade karma from 5.1.1 to 6.0.0 baby636/socket.io#96

Open

[Snyk] Security upgrade karma from 5.1.1 to 6.0.0 baby636/socket.io#98

Open

sampete1997 mentioned this issue Aug 19, 2023

On aws server side getting 404 not found error #4803

Open

This was referenced Dec 7, 2023

[Snyk] Fix for 1 vulnerabilities baby636/socket.io#180

Open

[Snyk] Fix for 1 vulnerabilities baby636/socket.io#181

Open

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Keep getting and posting /socket.io/?EIO=3&transport=polling&t= #3615

Keep getting and posting /socket.io/?EIO=3&transport=polling&t= #3615

chengtie commented Jun 25, 2020 •

edited

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SibiAkkash commented Jul 10, 2020

hmagrahi commented Jul 14, 2020

ven commented Jul 14, 2020

kfirprods commented Jul 18, 2020

saurav111 commented Jul 26, 2020

ven commented Jul 26, 2020 •

edited

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AvalancheAccessories commented Dec 21, 2021

darrachequesne commented Dec 21, 2021

sampete1997 commented Aug 19, 2023

Keep getting and posting /socket.io/?EIO=3&transport=polling&t= #3615

Keep getting and posting /socket.io/?EIO=3&transport=polling&t= #3615

Comments

chengtie commented Jun 25, 2020 • edited Loading

SibiAkkash commented Jul 10, 2020

hmagrahi commented Jul 14, 2020

ven commented Jul 14, 2020

kfirprods commented Jul 18, 2020

saurav111 commented Jul 26, 2020

ven commented Jul 26, 2020 • edited Loading

AvalancheAccessories commented Dec 21, 2021

darrachequesne commented Dec 21, 2021

sampete1997 commented Aug 19, 2023

chengtie commented Jun 25, 2020 •

edited

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ven commented Jul 26, 2020 •

edited

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