Pagespeed is an output filter for Apache 2.2+ that can be configured through a variety of options through configuration files or a .htaccess file.
GoAccess is an open source real-time web log analyzer and interactive viewer that runs in a terminal in *nix systems or through your browser.
Have you ever tested your website for speed with googles website test tool? Then you have seen the error: Leverage browser caching not enabled. To fix this you need to enable and configure mod_expires in Apache web server.