The ServerSupportFunction is a callback function that is supplied in the EXTENSION_CONTROL_BLOCK that is associated with the current HTTP request. ServerSupportFunction can be used to perform a variety of tasks.
BOOL ServerSupportFunction(
HCONN ConnID,
DWORD dwHSERRequest,
LPVOID lpvBuffer,
LPDWORD lpdwSize,
LPDWORD lpdwDataType
);
The parameter dwHSERRequest specifies the particular HTTP server extension request that is to be executed by IIS. For information on the other parameters, see the following list of links.
Note If a parameter is designated as unused in a particular support function, you should set that parameter to NULL.