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

您可以在ApplicationController中添加这个current_url方法来返回当前URL，并允许合并其他参数

# https://x.com/y/1?page=1 
# + current_url( :page => 3 )
# = https://x.com/y/1?page=3
def current_url(overwrite={})
    url_for :only_path => false, :params => params.merge(overwrite)
end

使用示例:

current_url --> http://...
current_url(:page=>4) --> http://...&page=4

你可以使用url_for(only_path: false)

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

对于rails 3:

request.fullpath

在Ruby on Rails 3.1.0.rc4中:

 request.fullpath