when available, use getaddrinfo(),inet_pton() instead of gethostbyname()
NOTE: behavior change: mod_scgi now listens to INADDR_LOOPBACK if "host"
is not specified. (Prior behavior was INADDR_ANY.) Backends
should not listen on potentially public IPs unless explicitly
configured to do so. This change matches a change to mod_fastcgi
made in 2008.
"gethostbyname deprecated, should use getaddrinfo"