Current intrusion detection systems work in isolation from access control for the application the systems aim to protect. The lack of coordination and inter-operation between these components prevents detecting and responding to ongoing attacks in real time, before they cause damage. To address this, we apply dynamic authorization techniques to support fine-grained access control and application level intrusion detection and response capabilities. This paper describes our experience withintegrationof the Generic Authorization and Access Control API (GAA-API) to provide dynamic intrusion detection and response for the Apache Web Server. The GAA-API is a generic interface which may be used to enable such dynamic authorization and intrusion response capabilities for many applications.