At the moment, we use both resolvers, and if either one is not
DNS_STATUS_IDLE, the other one is also not DNS_STATUS_IDLE. This may
change if we are going to configure DNS so that either A or AAAA
lookup is done. In that case, it is better to just return
DNS_STATUS_ERROR in the diff. This is because the calling side does
not expect DNS_STATUS_IDLE in that case.
We have added "dns" parameter to backend option. If specified, name
lookup is done dynamically. If not, name lookup is done at start up,
or configuration reloading. nghttpx caches DNS result including error
case in 30 seconds in this commit. Later commit makes this
configurable.
DNS resolution is done asynchronously using c-ares library.
Tatsuhiro Tsujikawa