caddy plugin retrives client mac if possible
This plugin reads /proc/net/arp for IP-Mac mapping info. Thus works only when client is from same layer-2 scope.
The plugin add a single arp directive, provices a placeholder {client_mac}.
:80 {
tls off
arp
root /srv
gzip
ext .htm .html
templates
header / x-mac {client_mac}
}