I need the sniffer to test network traffic of applications developed by me for Windows and Facebook.
Basic requirements:
Now I'm using HTTP Analyzer. A very good tool, but it terminates with some error after 10-15 min running on Vista.
Wireshark if you want to see everything going on in the network.
Fiddler if you want to just monitor HTTP/s traffic.
Live HTTP Headers if you're in Firefox and want a quick plugin just to see the headers.
Also FireBug can get you that information too and provides a nice interface when your working on a single page during development. I've used it to monitor AJAX transactions.