My favourite tool for debugging HTTP requests is Charles Proxy:
http://www.xk72.com/charles/  - Runs on Windows, Linux, OS X

Gives you a true view of what's going on as it sits between your web browser and the web server, intercepting all of the traffic flowing between them and letting you view every element of the request and the response.

If you're using Windows then a free tool called Fiddler does nearly as much:
http://www.fiddlertool.com/fiddler/

hth

Gareth


On Jan 21, 2008, at 10:43 AM, Mark Rogers wrote:

Does anyone know of a way from within Firefox that I can capture a 
sequence of redirects and work out what's happening?

I can use wget and see a sequence of 301/302 redirects that way, but I 
need to do this within a session so I really need to follow it in 
Firefox. Or Opera/IE I suppose (all on Ubuntu 8.04).

Something obscure is happening on one of my sites when I follow an HTTPS 
link which is causing it to redirect back to HTTP, which is probably 
something to do with something in the session that I'm not getting 
chance to investigate. Therefore the ability not just to capture the 
sequence but also to step through it would be helpful.

-- 
Mark Rogers // More Solutions Ltd (Peterborough Office) // 0845 45 89 555
Registered in England (0456 0902) at 13 Clarke Rd, Milton Keynes, MK1 1LG


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