Provides base for filters that have before/after semantics

Upon match, injects real caller WorkContext.EffectiveCallerIPEndPoint

Intercepts error that arise during processing and displays an error page for exceptions and error codes

Upon match, looks up user's geo location based on a IP addresses

Logs information extracted from WorkContext

Manages injection of portal into the work context

Upon match, redirects client to the specified URL resource. Specify matches with 'redirect-url' var

Checks permissions before doing work

Manages session state in work context

Stops the processing of WorkContext by throwing exception upon match