hurl.it makes HTTP requests – Twilio Labs.
You’re building apps, right? They’ve got APIs, right? The hardest part about testing an API should be the bugs you discover, not figuring out how to test. There are a lot of desktop app solutions that do exactly that, but this is the first browser based HTTP request generator I’ve seen.
It’s simple to use and worth a bookmark if you don’t have a current system in place.