As far as I have seen, there is no explanation as to where we are to locate the client side script for socket.io if node.js is not used as the web
socket.io
node.js
If you are using bower.json, add the socket.io-client dependency.
"socket.io-client": "0.9.x"
Then run bower install to download socket.io-client.
Then add the script tag in your HTML.