Make api fetch request.

async def api_request(self, url, params):
        """Make api fetch request."""
        request = None
        try:
            with async_timeout.timeout(DEFAULT_TIMEOUT, loop=self._event_loop):
                request = await self._api_session.get(
                    url, params=params)
            if request.status != 200:
                _LOGGER.error('Error fetching Emby data: %s', request.status)
                return None

            request_json = await request.json()
            if 'error' in request_json:
                _LOGGER.error('Error converting Emby data to json: %s: %s',
                              request_json['error']['code'],
                              request_json['error']['message'])
                return None
            return request_json
        except (aiohttp.ClientError, asyncio.TimeoutError,
                ConnectionRefusedError) as err:
            _LOGGER.error('Error fetching Emby data: %s', err)
            return None