# begin.rb
#!/usr/bin/env ruby
class Begin < Sinatra::Base
get ‘/‘ do
"index"
end
end
# config.ru require ‘rubygems‘ require ‘bundler‘ Bundler.require require ‘./begin‘ run Begin
# Gemfile source ‘http://ruby.taobao.org‘ gem ‘sinatra‘, :require => "sinatra/base"
原文：http://www.cnblogs.com/mfrbuaa/p/3892439.html