request_uri

# File actionpack/lib/action_controller/request.rb, line 135
    def request_uri
      if uri = env['REQUEST_URI']
        (%r{^\w+\://[^/]+(/.*|$)$} =~ uri) ? $1 : uri # Remove domain, which webrick puts into the request_uri.
      else  # REQUEST_URI is blank under IIS - get this from PATH_INFO and SCRIPT_NAME
        script_filename = env['SCRIPT_NAME'].to_s.match(%r{[^/]+$})
        uri = env['PATH_INFO']
        uri = uri.sub(/#{script_filename}\//, '') unless script_filename.nil?
        unless (env_qs = env['QUERY_STRING']).nil? || env_qs.empty?
          uri << '?' << env_qs
        end
        uri
      end
    end