WebBrick startup is slow if your machine name looks like a domain

Socket.gethostbyname is usually fast if your local machine has a normal name, because it crashes early, but if you have a name that looks like a real domain things take 5s.

Internally webbrick/config.rb does:

ruby -r socket -e 'Socket.gethostbyname(Socket.gethostname)'

Which is slow … wait for https://bugs.ruby-lang.org/issues/13007 to resolve … or rename your localhost to something that does not look like a domain to ruby.

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