I've released a (very preliminary) development release of a new project, App::htrepl, a commandline REPL for more easily debugging HTTP applications. It was inspired by a similar project for Node.js, the link to which I can't find at the moment. You can find the repository at github here, and it will be hitting your local CPAN mirror soon.
REPL means read-eval-print loop. App::htrepl provides a commandline script,
htrepl, which makes it easier to talk to your HTTP applications. The only dependencies are LWP and Term::ReadLine; the code is otherwise designed to be as lean as possible.
Here are some examples of how it can be used: