socket.io-client web socket connection failing in node.js child process

Question

I am using simple socket.io client module to connect to web socket but the connection is failing. The way I have learned is that right after you define socket, you can access connected property to find out the status of connection and it always return false. I am trying to connect to web socket in a child process on the same server where my main process is running.

var socket = require('socket.io-client')("ws://xx.xx.xxx.xxx");
console.log(socket.connected);

socket.io-client isn't a Websocket client. Also, socket.connected will only be true after the connect event has fired. — robertklep
– robertklep, Commented Jul 27, 2017 at 14:36
I have already tried checking the connect event and it never fires. — M.Dagiya
– M.Dagiya, Commented Jul 27, 2017 at 14:42
Well, like I said: socket.io-client isn't a Websocket client, it's a SocketIO client and thus requires a SocketIO server to connect to. — robertklep
– robertklep, Commented Jul 27, 2017 at 14:43
Sorry, I forgot to mention, I already have a server setup like so,var express = require('express'); var app = express(); var server = app.listen(6001); var io = require('socket.io').listen(server); — M.Dagiya
– M.Dagiya, Commented Jul 27, 2017 at 14:46
Try using require('socket.io-client')('http://localhost:6001') (not ws://...) If that still doesn't work, try adding some error handlers. Also, how did you start the child process? — robertklep
– robertklep, Commented Jul 27, 2017 at 14:47

robertklep · Accepted Answer · 2017-07-27 14:55:10Z

3

SocketIO connections should be initiated over HTTP(S):

var socket = require('socket.io-client')('http://localhost:6001');

(instead of ws://...)

Then wait for the connect event; when that fires, the client is connected to the server;

socket.on('connect', function() {
  console.log('connected to server!');
  ...
});

answered Jul 27, 2017 at 14:55

robertklep

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