That said, I regularly test APIs using actual usernames and passwords via HTTP Basic Auth. It will be a cold day in hell before I toss my credentials in cleartext into a web form. :-)
I really like the syntax-highlighted, pretty-printed JSON output, though. Really handy.
Very slick, but it really needs a JSON pretty printer in addition to the XML one. Most JSON services just send one huge line, which is exactly how Hurl displays it.
I think you meant that you can reproduce a fraction of this app's functionality, and present it in an unattractive way with really bad useability, in ten lines of code. And even then you'd be exaggerating.
Second, realize that this was developed from start to finish in 48 hours, by some not untalented people... they seem to have put a lot of thought into it, and the details really show.
Doesn't that seem to emphasize the guy's point? It seems like a neat if simplistic little tool and if you have to watch a video to tell how it's something more...
For example I can give you this URL: http://hurl.me/ufsmb1
And you can change 'json' to 'xml' to see what changes.
Hurl was inspired by sharing curl input and output over pastebins. We should probably make this more clear.