http://www.ieinspector.com/httpanalyzer/
http://www.microsoft.com/downloads/details.aspx?FamilyID=B134A806-D50E-4664-8348-DA5C17129210&displaylang=en
https://addons.mozilla.org/en-US/firefox/addon/9780/
http://soft-net.net/SendHTTPTool.aspx
https://addons.mozilla.org/en-US/firefox/addon/966/