Delphi TCP/IP Http Packet sniffer

I need a Delphi 7 source to monitor in realtime all http requests from local web browser(s). The code must work with Win98 and above &? with non-admin accounts. No GUI is needed, output with all the (realtime) http-requests will do it. I prefer solutions without known sniffer engines (like Winpcap and others). There will be a bonus, if it works also with known firewalls (e.g. ZoneAlarm). Note, that it should also work. The code should be as lightweight as possible.