Charles

Charles screenshots

Charles is a web debugging proxy application for Windows users
Time Chart
Charles 3.8 : Time Chart

Alternative downloads

Fiddler
Web debugging proxy that displays Internet traffic from your PC.
4.6.2.3
FREE
EffeTech HTTP Sniffer
HTTP packet sniffer and protocol analyzer.
4.1
WCAT Extension for Fiddler
WCAT is the best tool to hammer your web server with requests.
1.0
FREE