Message from 2021
This post is pretty old! Opinions and technical information in it are almost certainly oudated. Commands and configurations will probably not work. Consider the age of the content before putting any of it into practice.
While fixing some .htaccess/redirection issues to get LiveJournal to point to a recent RSS feed, I was using an old Java program I wrote to see the headers/guff Apache was giving me:
After trying the preview button that shows the request headers HTTPimp sends, I identified a bug - when it breaks the URL into address, path, and query parts, it mostly stitches them together correctly, except for the ? between path and query.