docs: def schedule(code, interval, secret_key=None, url=None):
    """Schedule a string of `code` to be executed every `interval`
  
    Specificying an `interval` of 0 indicates the event should only be run
    one time and will not be rescheduled.
    """
    if not secret_key:
      secret_key = default_key()
    if not url:
      url = default_url()
  
    url = '%s/schedule' % url
    values = {
      'interval': interval,
      'code': code,
    }
    return _send_with_auth(values, secret_key, url)