開発用ローカルサーバを立ち上げる方法 ref: http://qiita.com/higuma/items/b23ca9d96dac49999ab9

config.ru

run Rack::Directory.new '.'

file0.txt

$ python -m SimpleHTTPServer [ポート番号(デフォルトは8000)]

file1.txt

$ python3 -m http.server [ポート番号(デフォルトは8000)]

file2.txt

$ ruby -run -e httpd . -p 8000

file3.txt

$ [sudo] gem install rack

file4.txt

$ rackup
[2014-04-01 14:18:53] INFO  WEBrick 1.3.1
[2014-04-01 14:18:53] INFO  ruby 1.9.3 (2013-06-27) [i686-linux]
[2014-04-01 14:18:53] INFO  WEBrick::HTTPServer#start: pid=5814 port=9292

file5.txt

$ rackup
[2014-04-01 14:18:53] INFO  WEBrick 1.3.1
[2014-04-01 14:18:53] INFO  ruby 1.9.3 (2013-06-27) [i686-linux]
[2014-04-01 14:18:53] INFO  WEBrick::HTTPServer#start: pid=5814 port=9292

file6.txt

$ php -S localhost:3000