class method self.page_cache_directory

The cache directory should be the document root for the web server and is set using Base.page_cache_directory = "/document/root". For Rails, this directory has already been set to Rails.public_path (which is usually set to Rails.root + "/public"). Changing this setting can be useful to avoid naming conflicts with files in public/, but doing so will likely require configuring your web server to look in the new location for cached files.