Add some more output variables into print-headers-template

Author: git001

docker-files/opt/webroot/templates/print-headers-template.txt

@@ -1,3 +1,6 @@
+Remote-Host:       {{.Req.Host}}
+Remote-IP:         {{.RemoteIP}}
+Client-IP:         {{.ClientIP}}
 X-Forwarded-For:   {{.Req.Header.Get "X-Forwarded-For"}}
 X-Forwarded-Host:  {{.Req.Header.Get "X-Forwarded-Host"}}
 X-Forwarded-Port:  {{.Req.Header.Get "X-Forwarded-Port"}}