def __init__(self, host=None, api_url=None):
self.host = host<EOL>if not self.host:<EOL><INDENT>self.host = PushClient.DEFAULT_HOST<EOL><DEDENT>self.api_url = api_url<EOL>if not self.api_url:<EOL><INDENT>self.api_url = PushClient.DEFAULT_BASE_API_URL<EOL><DEDENT>
Construct a new PushClient object.

        Args:
            host: The server protocol, hostname, and port.
            api_url: The api url at the host.