Yep. They work directly, but not in a view.
Here's the Browser View config:
The result of that config:
And what it looks like when I hit the URL directly, substituting in the proper parameters:
For what it's worth, I also tried configuring the Browser View with the URL that works when you hit it directly and got the same blank box in response. The same thing goes for the interface connection app that's also included with the Weathermap package.