root_url(only_path: false) #=> http://localhost:3000/
request.host_with_port #=> localhost:3000
request.fullpath #=> /posts/index
url_for(only_path: false) #=> http://localhost:3000/posts/index
追記：Rails5での動作を確認しました。（より良い方法があるかどうかは未確認）
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