Entry-Point Functions

The ISA Server Web proxy calls entry-point functions in a Web filter to pass initialization information to the Web filter, to notify the Web filter that a certain event has occurred, and to inform the Web filter that it is about to be unloaded from memory. Web filters can implement the following entry-point functions that were also available for ISAPI Web filters in ISA Server 2000:

• GetFilterVersion
• HttpFilterProc

Web filters can also implement the following entry-point functions that are specific to ISA Server 2004:

• GetWPXFilterVersion
• HttpWPXFilterProc

Note  At a minimum, a Web filter must implement either GetFilterVersion and HttpFilterProc, or GetWPXFilterVersion and HttpWPXFilterProc (or both pairs of functions).

In addition, a Web filter can implement the following optional entry-point functions:

• TerminateFilter
• ReloadWpxFilterConfiguration

See Also

Web Filter Reference