Internet Server Application Programming Interface: Difference between revisions

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ISAPI filters are used to modify or enhance the functionality provided by IIS. They always run on an IIS server and filter every request until they find one they need to process. Filters can be programmed to examine and modify both incoming and outgoing streams of data.
 
Filters are implemented as DLL files and can be registered on an IIS server on a site level or a global level (i.e., thethey apply to all sites on an IIS server). Filters are initialised when the worker process is started and listens to all requests to the site on which it is installed.
 
Common tasks performed by ISAPI filters include: