HURL: Great Tool for Testing Web API's
If you're looking for a dead simple web-based tool for inspecting HTTP requests, look no further. HURL has an easy-to-use interface where you can submit URLs with headers and parameters then view both the requests and responses.
Here's an example of the interface and results for a request I made:
HURL also supports basic authentication and if you sign up for an account it will keep a running history of your requests. To view a complete demonstration of HURL, check out this video:
This looks like another great addition to my web development toolbox.