I am following the tutorial given at the url: https://codelabs.developers.google.com/codelabs/webrtc-web/#6
When I run the server and open index.html on browser then it gives me error http://localhost:8080/socket.io/?EIO=3&transport=polling&t=1486104971951-58 (not found) I have done everything which I could but I can't get rid of this error.
Install Socket.io inside your repository:
npm install socket.io --save
After, config the index.js(file from your tutorial):
var express = require('express')
var app = express();
var server = require('http').createServer(app);
var io = require('socket.io').listen(server);
server.listen(app.get('80'));
And inside your archive HTML/EJS or another you want, add:
<script src="/socket.io/socket.io.js"></script>
Check if works with Console (Chrome/ Mozilla, etc).
In my example I use Chrome (Ctrl + shift + I):
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