## get_base_url() Return the configured base URL of your Listmonk instance. Usage ``` python get_base_url() ``` Each Listmonk instance lives at its own address, for example https://listmonk.somedomain.tech. This getter returns whatever value was previously stored by set_url_base(). ## Returns `Optional[str]` The base URL of your instance (without a trailing slash), or None if set_url_base() has not been called yet.