ext_conf_template.txt

# cat=basic; type=options[reverse Proxy Check=0,Force Enabled=1,Force Disabled=2]; label=Should the advanced cache headers be send?: By default the configured reverseProxyIP is checked using the REMOTE_ADDR. If there is a match, we send the cache headers. You can also force or disable the header directly. 
sendCacheHeaders = 0

# cat=basic; type=string; label=Varnish Hostnames: comma-separated list with hosts to send purge commands to. If left empty the current HTTP Host is used.
hostnames = 127.0.0.1