caddy.tmpl

{{ range $host, $containers := groupByMulti $ "Env.VIRTUAL_HOST" "," }}
{{ $host }} {
  {{ range $index, $value := $containers }}
    {{ $addrLen := len $value.Addresses }}
    {{ if eq $addrLen 1 }}
      {{ with $address := index $value.Addresses 0 }}
      proxy / {{ $address.IP }}:{{ $address.Port }} {
        proxy_header Host {host}
        proxy_header X-Real-IP {remote}
        proxy_header X-Forwarded-Proto {scheme}
      }
      {{ end }}
    {{ else if $value.Env.VIRTUAL_PORT }}
      {{ range $i, $address := $value.Addresses }}
        {{ if eq $address.Port $value.Env.VIRTUAL_PORT }}
        proxy / {{ $address.IP }}:{{ $address.Port }} {
          proxy_header Host {host}
          proxy_header X-Real-IP {remote}
          proxy_header X-Forwarded-Proto {scheme}
        }
        {{ end }}
      {{ end }}
    {{ else }}
      {{ range $i, $address := $value.Addresses }}
        {{ if eq $address.Port "80" }}
        proxy / {{ $address.IP }}:{{ $address.Port }} {
          proxy_header Host {host}
          proxy_header X-Real-IP {remote}
          proxy_header X-Forwarded-Proto {scheme}
        }
        {{ end }}
      {{ end }}
    {{ end }}
  {{ end }}
}
{{ end }}