Apache mod_proxy: forward secure websocket to non-secure

To get things to work, I also needed to load mod_proxy_wstunnel

Once I did, this ruleset got things working: (in the VirtualHost of the domain that receives and proxies the websocket request)

<IfModule mod_proxy.c>
    ProxyPass "/_ws_/" "ws://127.0.0.1:8080/"
    ProxyPassReverse "/_ws_/" "ws://127.0.0.1:8080/"
</IfModule>

The browser can then contact the backend WS server through the HTTPS port:

var ws = new Websocket('wss://example.com/_ws_/');

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