function TMyFilterHandler.Start(szUrl: PWideChar; OIProtSink: IInternetProtocolSink;
  OIBindInfo: IInternetBindInfo; grfPI, dwReserved: DWORD): HResult; stdcall;

Result := S_False;

然后就会发现该链接是被忽略了，但WB的状态却无法切换到“结束�