Thought I tried that before but that worked. Thx @Whitestrake. Also needed to fiddle with my base url. Must be absolute and must end with /
Here is what worked.
https://status.foo.net/router {
import wildcard_cert
filter rule {
content_type text/html.*
search_pattern <head>
replacement "<head><base href='https://status.foo.net/router/'>"
}
proxy / http://router.foo.net:19999
}
Hope others find this post cause it is really useful for leveraging a single sub/domain pointing to lots of supporting servers. Now I can have for instance status.foo.net/router and status.foo.net/nas etc for a status page for each device served from that device on my network and yet other requests will go to my main status page which can of course have links to theseā¦nice.