I like that it has several different ways to configure your request which include HTTP requests or POSTS/GETs etcetc..
This allows you not only get all aspects but also gives great advice if something isn't working. It's easy enough even without being an expert with programming languages - there are plenty guides online too! You can tell what errors might be happening from just looking through them so this makes troubleshooting easier when compared against other free options out their such us FireBug where sometimes they don'y give any warnings about why things aren;t executing correctly e g sending GET instead off DELETE.