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Railsでは起動ログを見ると じゃなくて で待ち受けてるのって何でだろう?
そもそも ってなんだったっけ?

=> Booting WEBrick
=> Rails 4.0.0 application starting in development on
=> Run rails server -h for more startup options
=> Ctrl-C to shutdown server

と思って調べたら、 は「全てのアドレスを示す」ので外部からでも接続できるってことらしい。

Why does Ruby on Rails use instead of http://localhost:3000? - Stack Overflow

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