Ruby 对于heroku上的非rails应用程序，config.ru中有什么内容？

我有一个简单的ruby（非rails）应用程序，它使用resque，在heroku上没有config.ru就无法启动。添加config.ru文件时，在本地运行

rackup

时会出现以下错误：

/usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:133:in `to_app': missing run or map statement (RuntimeError)
from /Users/nickkarrasch/Dropbox/Coding/Ruby/smsnotifyv2/config.ru:in `<main>'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:49:in `eval'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:49:in `new_from_string'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:40:in `parse_file'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:277:in `build_app_and_options_from_config'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:199:in `app'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:314:in `wrapped_app'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:250:in `start'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:141:in `start'
from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/bin/rackup:4:in `<top (required)>'
from /usr/local/Cellar/ruby/1.9.3-p194/bin/rackup:23:in `load'
from /usr/local/Cellar/ruby/1.9.3-p194/bin/rackup:23:in `<main>'

/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:133:in'to_app'：缺少运行或映射语句（运行时错误）
from/Users/nickkarasch/Dropbox/Coding/Ruby/smsnotifyv2/config.ru:in`'
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:49:in'eval'
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:49:in“new_from_string”
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/builder.rb:40:in“parse_file”
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:277:in“build\u app\u和\u options\u from\u config”
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:199:in'app'
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:314:in'wrapp'
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:250:在“开始”中
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:141:in'start'
from/usr/local/ceral/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rack-1.5.2/bin/rackup:4:in`'
from/usr/local/cillar/ruby/1.9.3-p194/bin/rackup:23:in'load'
from/usr/local/ceral/ruby/1.9.3-p194/bin/rackup:23:in`'

我需要在config.ru中放入什么？

该文件的内容（config.ru）将取决于您实际尝试执行的操作以及您正在使用的框架，因为该框架仅用于配置机架应用程序，它告诉

Rack:：Builder

应该使用什么中间件以及使用的顺序。以下是Heroku文档中提供的一些示例：

西纳特拉：

require './hello'
run Sinatra::Application

require ::File.expand_path('./../hello', __FILE__)
Ramaze.start(:file => __FILE__, :started => true)
run Ramaze

Ramaze：

require './hello'
run Sinatra::Application

require ::File.expand_path('./../hello', __FILE__)
Ramaze.start(:file => __FILE__, :started => true)
run Ramaze

露营

require './hello'
run Rack::Adapter::Camping.new(Hello)