gzip_file_path

# File actionpack/lib/action_dispatch/middleware/static.rb, line 77
      def gzip_file_path(path)
        can_gzip_mime = content_type(path) =~ /\A(?:text\/|application\/javascript)/
        gzip_path     = "#{path}.gz"
        if can_gzip_mime && File.exist?(File.join(@root, ::Rack::Utils.unescape(gzip_path)))
          gzip_path
        else
          false
        end
      end