Well, that is emphatically *NOT* what application developers
do. They do not just observe that it does not work, they try
to work around, e.g. routing messages to a different address,
at a different time, through a third party, or through a
different protocol.
Indeed, correctly coded applications will use a getaddrinfo()
and then a connect() in a loop until succesful.
it's perfectly reasonable to connect to an address without first
doing a DNS lookup. even when you need to do a DNS lookup,
getaddrinfo() doesn't always do what you need.
Keith