isapi filter

from The Free On-line Dictionary of Computing (8 July 2008)

ISAPI filter

   <World-Wide Web> A replaceable {DLL} which the {server} calls
   whenever there is an {HTTP} request.  When the filter is first
   loaded, it communicates to the server what sort of
   notifications will be accepted.  After that, whenever a
   selected event occurs, the filter is called to process the
   event.

   Example applications of ISAPI filters include custom
   {authentication} schemes, {compression}, {encryption},
   logging, traffic analysis or other request analyses.

   (1997-01-06)