Thanks for submitting a ticket to the jQuery bug tracker!. Although we're not able to directly assist with issues related to third party products or services, it's possible that you or a plugin being used is applying some logic to all link elements or attempting to pre-fetch content via $.ajax. The above '/a' may in fact not exist on your server if this is the case (I'm just giving this my best guess). Please double check your code to ensure that the above is not the case, failing which, speak to Acunetix to find out how they deem links as broken.