Help configuring nodered+apache2 (create subdomain)

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Hi, I've installed node-red in VPS with domain name mydomain.net, it's works normally under mydomain.net:1880. However I want to make the url it tidier by creating subdomain nodered.mydomain.net using apache2. Here's my configuration:

<VirtualHost *:80>
        ServerName nodered.mydomain.net
        ServerAlias *.nodered.mydomain.net
        ProxyRequests Off
        ProxyPreserveHost On
        ProxyPass / http://localhost:1880/
        ProxyPassReverse / http://localhost:1880/
</VirtualHost>

The flow editor is giving me Lost connection to server message, the console message is WebSocket connection to 'ws://nodered.mydomain.net/comms' failed:
Any idea how to fix that? I'm very newbie on networking stuff and most of configuration I've made just by following tutorial on internet.
I think the general function works normally, but it just annoying to have that message.

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