'Driver for CORS field. Calls helpers as needed.
return: (bool, [list of AuditIssues])'

def inspect_cors(self, item):

    cors = item.config.get('Cors')
    if cors:
        errors = []
        err = self._cors_method(cors)
        (errors.extend(err) if err else None)
        if errors:
            return (False, errors)
    return (True, None)
