The IInetLogInformation::GetExtraHTTPHeaders method retrieves a null-delimited list of parameters requested by the logging module from the Web server.
virtual LPSTR STDMETHODCALLTYPE GetExtraHTTPHeaders(
IN PCHAR pszHTTPHeaders,
IN PDWORD pcbSize
);
Logging modules should query for this method if a server instance has set the LogExtFileCookie, LogExtFileUserAgent, or LogExtFileReferer metabase identifier.
LogExtFileCookie, LogExtFileReferer, LogExtFileUserAgent, LogExtFileFlags