I would like to be able to enforce a trailing slash on all pages of my website, because pages that don’t have it will break (due a redirect from a subdomain). I have tried with JS using some of these suggestions: javascript/jquery add trailing slash to url (if not present) - Stack Overflow
However, I am not even sure whether my script is enforced. When should it be called in the page and how can I make sure it is actually enforced?