isapi

Like Internet Server API (ISAPI) extensions, ISAPI filters are programs that respond when the application server receives an HTTP request. However, unlike ISAPI extensions, ISAPI filters are always run in the server process. ISAPI filters are different from applications because they are driven by Web server events instead of a client request. You can associate an ISAPI filter with a particular Web server event; the filter is then notified every time its associated event occurs. For example, a filter could be notified when a Read or Write event occurs and then encrypt the raw data to be returned to the client.

You can install filters for all of the sites on an application server (global filters), and you can install filters for individual Web sites (site filters). If you install both global filters and site filters, the two filter lists are merged for the site.

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 that are set in the master properties are run before the filters that are set at the site level. Filters with the same priority at the same inheritance level are run in the order in which they were loaded. You can change the filter load order by adjusting the properties for the Web server or the Web site.

Mig bekendt kan du ikke med isapi filtre forhindre exefiler i at køre på serveren.

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