The IInetLogInformation::GetProtocolStatus method retrieves the protocol-dependent status code returned to the client.
virtual DWORD STDMETHODCALLTYPE GetProtocolStatus( VOID );
Logging modules should query for this method if a server instance has set the MD_EXTLOG_HTTP_STATUS flag of the MD_LOGEXT_FIELD_MASK metabase identifier.
LogExtFileHttpStatus, MD_LOGEXT_FIELD_MASK