WASap is an Apache module (version 1.3.x), which acts as an Application level Firewall. It can filter and block malignant requests.
It has the following functionality/features:
* Purification of modules at server/directory level
* Individual Configuration for each module
* chk_class.c: A module which can filter by class by alphanumeric, length and metacharacters (more info later ...)
* etc...