资料来源 : Free On-Line Dictionary of Computing

ISAPI filter
     
         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)