module ActionController::Caching::Pages::ClassMethods

def page_cache_file(path, extension)
  name = (path.empty? || path == "/") ? "/index" : URI.parser.unescape(path.chomp('/'))
  unless (name.split('/').last || name).include? '.'
    name << (extension || self.page_cache_extension)
  end
  return name
end