OpenBSD bgplg cgi script help

[Strykar (Avinash H Duduskar)]

I’m trying to get OpenBSD’s bgplg (BGP looking glass) working with Caddy.
The original implementation assumed nginx and works well with this config:

ext_addr="0.0.0.0" 
 
server "lg.example.net" { 
	listen on $ext_addr port 80 
	location "/cgi-bin/*" { 
		fastcgi 
		root "" 
	} 
}

When I try to get this working in Caddy I see the page load, but the drop down menu (using the binary bgplgsh) does not work. nginx would assume the existence of resolv.conf and a few related binaries under:

var/www/cgi-bin/bgplg
/var/www/cgi-bin/bgplg
/var/www/etc

It would also use a local socket to communicate with the bgp daemon:
socket "/var/www/run/bgpd.rsock" restricted

See:
https://man.openbsd.org/bgplg.8
http://www.ogris.de/howtos/openbsd-looking-glass.html

Any help on getting this to work with Caddy is appreciated, it’d help me turn off running nginx on port 81.