raise on non-200?

[jrochkind]

The response object has a #responsecode, implying that you might find a code other than 200 there.

But if the API returns a 5xx (say, because I didn't give it the right secret key), I don't get back a response with a 5xx responsecode... I get an exception raised.

Would it make more sense to make this not raise but return a non-200 response code? Or to make it a call option? Or to at least document in what cases one should expect an exception (of what class) to be raised?