I am having problems getting ALL of the information that is downloaded to a browser. For example, I want a plugin, ideally a firefox plugin to download the HTML content and monitor when I get a 302 redirect, and all header information.
So far, use Live HTTP Headers and Firebug. Both are fine.
With Live HTTP headers, I can't monitor the data that is downloaded (e.g. the html data) Firebug is worse, because I can't monitor the headers and I can't monitor the full requests. For example, Firebug won't show you all of the content that is downloaded, just the last set of requests. E.g. redirects will clear the Firebug net monitoring.
I am on win32
Try Tamper data firefox add-on, an extension to track and modify http/https requests.
You can find a nice tutorial here.
Firebug + Tamper Data is the best couple of firefox tools I cannot live without.