Web Site Properties - ISAPI Filters Property Sheet
Use this property sheet to set options for ISAPI filters. An ISAPI filter is a program that responds to events during the processing of an HTTP request. An ISAPI filter is always loaded in the Web siteÆs memory.
The table lists the status of each filter (loaded, unloaded, or disabled), the name of the filter, and the priority rating of the filter (high, medium, or low) set inside the DLL. Click the Add, Remove, and Edit buttons to modify filter mappings. Click the Enable or Disable button to modify the status of filters. Select a filter and click the arrows to change the order in which filters are loaded.
The Details box lists the status of the selected filter, the filter name, the executable file that contains the filter, and the priority rating of the filter.
All Web sites on a server inherit the filters configured in the master properties for the Web service. If you add filters to an individual site, the filter lists are merged. The filters set by the master properties do not appear on this tab when you view it for a site. Only the filter list for the site appears.
When several filters have registered for the same event, they are called sequentially. Filters with a higher priority are run before filters with a lower priority. If several filters have the same priority, global filters set in the master properties are run before filters set at the site level. Filters with the same priority at the same inheritance level are run according to the order in which they were loaded.