I have :

1. Apache (v2.4) on port 80 of my server for www.domain1.com, with mod_proxy and mod_proxy_wstunnel enabled

2. node.js + socket.io on port 3001 of the same server.

Accessing www.domain2.com (with port 80) redirects to 2. thanks to the method described here. I have set this in the Apache configuration:

<VirtualHost *:80>
    ServerName www.domain2.com
    ProxyPass / http://localhost:3001/
    ProxyPassReverse / http://localhost:3001/
    ProxyPass / ws://localhost:3001/
    ProxyPassReverse / ws://localhost:3001/
</VirtualHost>

It works for everything, except the websocket part : ws://... are not transmitted like it should by the proxy.

When I access the page on www.domain2.com, I have:

Impossible to connect ws://www.domain2.com/socket.io/?EIO=3&transport=websocket&sid=n30rqg9AEqZIk5c9AABN.

Question: How to make Apache proxy the WebSockets as well?