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importScripts('/socket.io/socket.io.js'); self.onmessage = function (ev) { var url = ev.data , socket = io.connect(url); socket.on('done', function () { self.postMessage('done!'); }); socket.on('connect_failed', function () { self.postMessage('connect failed'); }); socket.on('error', function () { self.postMessage('error'); }); socket.send('woot'); }