Are there any simple sample code showing ngrok forwarding socket.io/websocket (running under nodejs on localhost)?
In other words, does
ngrok http 3000
work with a nodejs server and socket.io running on port 3000? Or something like
ngrok http+tcp 3000 (just wild guessing)
Yes. If your node app is working off of port 3000 like in your example then just use ngrok to create a reverse proxy to expose 3000 to the world. Websockets will work just fine with it.
(Self-answer moved from the question into the answers section)
simply use
ngrok http 3000
You will see the web address string that localhost binds to. So in the client javascript code, change
var socket = io.connect('http://localhost:3000');
to
var socket = io.connect('http://94349fe6.ngrok.io');
NOTE:
http://94349fe6.ngrok.io is just that web address string. Yours will be different from this one.
Actually, if one simply does:
var socket = io();
as the introduction to socket.io states:
it defaults to trying to connect to the host that serves the page
So it works as well.
