in WebSocket connection failed

I am using to connect to a different domain, and it can successfully connect using polling, however when attempting to connect using websockets gets the error “WebSocket connection to ‘wss://XXXXX’ failed”.

After observing the network activity the server seems to indicate that it is capable of upgrading to a websocket connection (although I won’t claim to be an expert in understanding these requests), but isn’t able to do so:

console shows that its not able to make websocket connection

I’m just trying to produce a minimal viable product right now so here is my node.js server code:

let http = require('http');
let https = require('https');
let fs = require('fs'); 
let express = require('express');

const privateKey = fs.readFileSync('XXXXXXXXX', 'utf8');
const certificate = fs.readFileSync('XXXXXXXXX', 'utf8');
const ca = fs.readFileSync('XXXXXXXXX', 'utf8');

const options = {
    key: privateKey,
    cert: certificate,
    ca: ca

let app = express();

let httpsServer = https.createServer(options,app);
let io = require('')(httpsServer, {
    cors: {
        origin: true


io.sockets.on('connection', (socket) => {
    console.log("something is happening right now")

    socket.on("salutations", data => {
        console.log(`you are now connected via ${}`);
        socket.emit("greetings", "I am the socket confirming that we are now connected");

Client-side JavaScript:

const socket = io("https://XXXXXXX");

socket.on("connect", () => {
    console.log("now connected");

    socket.on("message", data => {

    socket.on("greetings", (elem) => {

let h1 = document.querySelector('h1');
    console.log("I am now doing something");
    socket.emit("salutations", "Hello!");

The only suggestion in the official documentation for this issue isn’t relevant because I’m not using a proxy, and other suggested fixes result in no connection at all (presumably because they prevent it from falling back to polling)


a neural network which can simulate a lava lamp in an infinite loop

Let’s See How Far iPhone Has Come Since Its Launch