Case Sensitive Paths
By default, Acunetix will try to automatically detect whether the target web server uses case-sensitive URLs. Most, but not all, web servers are case sensitive. In addition, some web applications can be configured to be case sensitive or insensitive using rewrite rules or other mechanisms.
If you need to force the crawling process to be case sensitive (to ensure accuracy and completeness for a target which you know is case sensitive) or insensitive (to reduce scan time for a target which you know is case insensitive), you can use this option.