如何从Rails页面内请求Rails页面?

某个操作必须根据 uri 参数。它对于所有有效的URI都可以正常工作,除了当前服务器的URI。是否有一种简单的方法从控制器中请求页面?

require 'uri'
class MainController < ApplicationController
  def foo
    uri = URI(params[:uri])
    if uri.host =~ /localhost|mydomain\.com/
      # what goes here?
    else
      @html = Net::HTTP.get(uri)
    end
    # Do something useful with @html...
  end
end
# The code should work for http://localhost/foo?uri=http://apple.com/
# as well as for http://localhost/foo?uri=http://localhost/bar