ResourceWarning:unclosed transport (HABApp)

Setup, Configuration and Use Scripts & Rules
1

I have a little peace of code which downloads a website for further data analysis.

It seems to work as it should (I get all the data I need), but in the log I get always the message:
2022-09-10 20:47:08.725 [WARN ] [HABApp.Rule ] - /usr/lib/python3.9/asyncio/sslproto.py:320: ResourceWarning:unclosed transport <asyncio.sslproto._SSLProtocolTransport object at 0x72f20928>

What can I do to stop this warning?
How can I react on it and close the transport?

    async def ExtractLocalData(self):
        '''
        offizielle COVID-19 Daten aus Homepage extrahieren
        '''
        LOGGER = self.__class__.__name__ + ".ExtractLocalData "

        # Website einlesen
        URL = "https://www.touvia.de/mapapi.html?v2&cn=oal&no_clusterer&data_source=oal-covid-19"

        HTTPStruct = None
        try:
            async with self.async_http.get(URL, timeout=9) as resp:
                HTTPStruct = await resp.text()
        except asyncio.TimeoutError:
            self.log.error(LOGGER + "Timeout beim Holen der lokalen COVID-Daten")

        #     ResourceWarning:unclosed transport <asyncio.sslproto._SSLProtocolTransport object at 0x72fdd9b8>
        if HTTPStruct is None:
            return