HTTP Header Sniffer +
If you are interested in the headers of your HTTP Requests (and you should be interested), it is often hard to find the right tool for the job. On Windows I used Fiddler, which works well for IE and Chrome, but needs a proxy entry to work with Firefox. A commercial but also very nice tool is HttpDebuggerPro, which has a good interface and filters.
I have switched to the Mac and was searching for a good tool. Live HTTP Headers is a Firefox Plugin but I don’t really liked it. Installed it today and the interface could be used for three requests, but has no overview for a lot of requests. With a search in the Firefox Add-Ons I found HttpFox. It is exactly the tool I searched for. I nice table with all requests and a split panel of the bottom for request and response headers.
Have a look at the screenshot and install it – as soon as possible. Why?

Der Link zu “Step by step to a faster web app (german)” ist tot.
Thanks, the link is fixed.