page_cache_file

# File actionpack/lib/action_controller/caching/pages.rb, line 101
          def page_cache_file(path, extension)
            name = (path.empty? || path == "/") ? "/index" : URI.unescape(path.chomp('/'))
            unless (name.split('/').last || name).include? '.'
              name << (extension || self.page_cache_extension)
            end
            return name
          end