Yield all HTTP methods in ``rh`` that are decorated
    with schema.validate

def _get_rh_methods(rh):
    """Yield all HTTP methods in ``rh`` that are decorated
    with schema.validate"""
    for k, v in vars(rh).items():
        if all([
            k in HTTP_METHODS,
            is_method(v),
            hasattr(v, "input_schema")
        ]):
            yield (k, v)