Most of the referrers for my website are Search Engines and I would like to store the referrer link so that I can study the keywords that lead to my page being displayed and clicked. I currently notice these links only in my Apache Error Log files when some Warning is thrown. Is there any module that I can make use so that it automatically stores all the HTTP_REFERRER links. Currently in prestashop I noticed only 404 page referrers are stored.
Prestashop already store referrer by default. Check menu Statistics -> Visitors Origin. If you want a more detailed statistic you should install Google Analytics module.
Good luck