Node.js "ws" websocket server randomly disconnects client after ~30 seconds, error 1006

Question

I have a simple websocket server like so:

const WebSocket = require('ws');
const wss = new WebSocket.Server( { server: server, path: "/ws" });

wss.on('connection', function connection(ws, req) {

    console.log("Connected");
    ws.on('message', function incoming(message) {
        console.log('received: %s', message);
    });

    ws.on('close', function close(code, reason) {
        console.log("Code: "+code+" | Reason: "+reason);
        console.log('disconnected');
    });

    ws.send('something');
});

I have a client that connects to it fine, but after about 30 seconds of connection, the websocket server closes the connection with an error code of "1006". Google tells me this means the connection was abnormally disrupted. However, I'm not sure what could be causing this. The ws.on('error') callback is also not triggered. How do I keep an indefinite/longer connection with my client?

Answer 1

Nginx has 30 seconds set as the default timeout.

You'll need to increase this number using a proxy_read_timeout directive.

For example, to extend the timeout to a day (which is probably overkill)

proxy_read_timeout 86400s;

Usually I set this in the location section, so that it can be overridden just for the websocket without impacting areas where it can be desirable to have the default.