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I'm trying to create a test using LearnBoost's socket.io and the node-websocket-client . Communication between the client and server work great. After all communication is done, I close both the client and the server. Yet the program hangs, waiting on some unknown callback. Two questions: What is the following program waiting for? Is there a tool for diagnosing outstanding callbacks in node programs? var connect = require('connect'), io = require('socket.io'), WebSocket = require('websocket-client').WebSocket; var port = 7111; var server = connect.createServer(); var socket = io.listen(server); socket.on('connection', function(client) { client.send('Welcome!'); client.on('message', function(message) { console.log(message); }); client.on('disconnect', function() { console.log('closing'); server.close(); }); }); server.listen(port, function() { var ws = new WebSocket('ws://localhost:' + port + '/socket.io/websocket'); ws.onmessage = function(message) { console.log(message.data); }; setTimeout(function() { ws.send('~m~3~m~Yo!'); ws.close(); }, 10); }); EDIT: changed the variable name of the WebSocket to ws to avoid confusion

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