ServerSupportFunction

Points to the ServerSupportFunction function used to extend the Web (ISAPI) filter functions. Parameters are specific to the extensions. The ServerSupportFunction callback function can be used by Web (ISAPI) filters to accomplish a wide variety of tasks.

The ServerSupportFunction function is declared as:

BOOL WINAPI * ServerSupportFunction(
  PHTTP_FILTER_CONTEXT pfc,
  enum SF_REQ_TYPE sfReq,
  PVOID pData,
  DWORD ul1,
  DWORD ul2
);

The parameter sfReq specifies the particular support function that is to be executed by the ISA Web proxy service. The remaining parameters are described in the individual support function sections; see the following list:

SF_REQ_ADD_HEADERS_ON_DENIAL

SF_REQ_DISABLE_NOTIFICATIONS

SF_REQ_NORMALIZE_URL

SF_REQ_SEND_RESPONSE_HEADER

SF_REQ_SET_NEXT_READ_SIZE

Note  If a parameter is designated as unused for a particular support function, you should set the parameter to NULL or 0, as appropriate.

SF_REQ_GET_CONNID is not supported by ISA or by IIS 4.0 or later and will return 0.

SF_REQ_GET_PROPERTY is not supported by ISA and will return 0.

SF_REQ_SET_PROXY_INFO is not used in the ISA implementation of ISAPI.