How can I track HTTP headers sent and received from my computer?

Question

Possible Duplicate:
Monitor all and any internet traffic from my home PC - what should I use?

I know there is a program called Live HTTP Headers for Firefox. Then there is ieHTTPheaders for Internet Explorer.

I knew another good program – someone told me, but I forgot. That program could display traffic for all programs, not just IE and Firefox.

What is it?

Answer 1

Wireshark for Windows and Linux. Remember to install WinPcap.

Tcpdump for Linux console.