ZombieBZ
Deno•10mo ago•
1 reply
ZombieB

Socket failing to transmit/receive when using 'upgrade' event and socket.write on Expressjs server

Hi, I'm using the ws npm module with my Express server (lots of routes were imported from a different project, one using Node with express in mind). Use of either socket.end or socket.write hangs the request.

The event listener is attached to the Server given by app.listen().

The script with this bug commented out is here (ctrl+f for 'upgrade'): https://gitea.proxnet.dev/zombieb/galvanic-corrosion/src/branch/master/src/main.ts

I can reproduce the problem here:
import { WebSocketServer } from "ws";
import express from "express";

const app = express();

app.use((rq, rs) => {
    rs.sendStatus(404);
});

const wss = new WebSocketServer({ noServer: true, path: "/" });
wss.on('connection', socket => {
    socket.send("Hello World!");
    socket.on('message', data => {
        console.log(`Got data: ${data.toString()}`);
        
        if (data.toString() === "close") {
            socket.send("Bye!");
            socket.close();
        }
    });
});

const server = app.listen(3000);

server.on('upgrade', (req, socket, head) => {

    console.log('upgrade request');
    socket.write("HTTP/1.1 404 Not Found\r\n\r\n");
    socket.end();
    wss.handleUpgrade(req, socket, head, ws => {
        wss.emit('connection', ws, req);
    });
});


Without socket.write and socket.end, the server works as expected. With them, the response hangs.
Is this something I should create an issue for?

Any help appreciated.
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