Access TrueNas through a reverse proxy using Apache

[RFR]

I have reviewed the post https://www.truenas.com/community/threads/reverse-proxy-for-ui.86873/ and I can get that to work.
<IfModule mod_proxy.c>
RewriteEngine On
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*) ws://server-name/$1 [P,L]

ProxyPass "/" "http://server-name/"
ProxyPassReverse "/" "http://server-name/"
</IfModule>

This is fine but I would like to access TrueNas at "/nas/" rather than "/". Has anyone had success at doing this? I am guessing that TrueNas is using absolute paths for resources under /ui, but I am not sure how to resolve that in a reverse proxy.

What I am looking for would look something like below:

<IfModule mod_proxy.c>
RewriteEngine On
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*) ws://server-name/$1 [P,L]

ProxyPass "/nas/" "http://server-name/"
ProxyPassReverse "/nas/" "http://server-name/"
</IfModule>

This does not work as TrueNas seems to be using absolute paths and looks for resources in http:/proxy.com/ui/some.css instead of http://proxy.com/nas/ui/some.css.

 

[Nick2253]

This doesn't specifically answer your question, but due to problems like this, I've taken to using subdomains over paths. For example, nas.proxy.com instead of proxy.com/nas.

 

[RFR]

I was thinking of that, but would like to figure out the issue.

 

[Nick2253]

I'm guessing that you need to pass something with the headers. See this post for Nginx example (https://www.truenas.com/community/t...xy-legacy-ui-works-but-material-doesnt.68256/). If I'm understanding that correctly, for Apache, you'd use ProxyAddHeaders.

If TrueNAS won't read from the Headers, then you can use ProxyHTMLEnable to have Apache dynamically rewrite the served HTML.