对于rails 3:

request.fullpath

对于Rails 3。X向上:

#{request.protocol}#{request.host_with_port}#{request.fullpath}

对于Rails 3.2及更高版本:

request.original_url

因为在rails 3.2及更高版本中:

request.original_url = request.base_url + request.original_fullpath

欲了解更多信息，请访问http://api.rubyonrails.org/classes/ActionDispatch/Request.html#method-i-original_url

我需要应用程序URL，但带有子目录。我使用:

root_url(:only_path => false)

在Ruby on Rails 3.1.0.rc4中:

 request.fullpath

(url_for(:only_path => false) == "/" )? root_url : url_for(:only_path => false)

在Rails 3中你可以使用

request.original_url

http://apidock.com/rails/v3.2.8/ActionDispatch/Request/original_url