I keep a regular watch on the the Redirect Component and lately I have noticed a lot of 404s being registered that is a bit confusing.
For instance, there is a SEF link like
/books/new-book which works fine. Now I see a 404 on
/books/new-book/index.php even though nowhere in the site is there a link like that. I haven't messed about with the core .htaccess file although I have added a few custom redirect 301s none of which does anything to add/update index.php. I have tried recreating the scenario but failed and when sometimes there is a link in the referrer column, it is the exact same link as the 404ed link which makes little sense.
Could I be missing something rather obvious here or be able to test if it is indeed my Redirect 301s? Thanks.