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I'm developing a web application and I'm trying to check the HTTP traffic is going on whenever a page loads.

Which application can I use? I'm on OS X Lion. I'm fine with either command line based or gui based apps. I just need to know whenever the app does a GET/POST to the server.

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why not good old tcpdump? – MaQleod Oct 15 '11 at 1:50
should add the command to specify http traffic: tcpdump -i <interface> port 80 or 443 – MaQleod Oct 15 '11 at 2:00
Hi! Thanks to your comment. U reminded me of tcpdump and I went to do a search. I didn't know tcpdump could do that! Here is a link to the post which gave me more details on what I wanted. – tommi Oct 15 '11 at 7:43

Wireshark is the best tool for sniffing network traffic. And it works on Lion as this posting demonstrates:

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