Code review comment for lp://qastaging/~u-matt-h/nova/aws-api-validation

Is there a reason that you are validating only string values, and not unicode with the validate_str method? Are non-ASCII values prohibited in urls?

Also, it would be better to use:

if not isinstance(val, str):
(or even: if not isinstance(val, basestring): if unicode should be allowed)

... instead of:
if type(val) != str